| SURNAME | GIVEN NAME | CD # | NEWSPAPER | DATE | PAGE | SUBJECT | NOTES | MP |
| ICELY | John E. | 14 | Parker City Daily | 13 Jul 1876 | 3 | Guest of Railroad | Switzerland | |
| ICKES | Catharine | 2 | Butler Sentinel | 30 Dec 1826 | 3 | Marriage | Buffalo Twp. | |
| IDDINGS | William | 2 | The Repository | 19 Aug 1836 | 3 | Estate | ||
| IDDINGS VS ROBB | 2 | Butler Sentinel | 02 Jan 1830 | 4 | Jan 1830 Court Term | |||
| IFFT | Caroline Josephine | 15 | Connoquenessing Valley News | 05 Dec 1889 | 3 | Death Notice | ||
| IFFT | Clarence | 16 | Connoquenessing Valley News | 28 Nov 1899 | 1 | Returned Home | ||
| IFFT | E. J. | 14 | The Butler Citizen | 07 Jun 1882 | 4 | For Sale | Butler | |
| IFFT | Emma M. | 15 | Connoquenessing Valley News | 14 May 1891 | 4 | Marriage License | Butler | X |
| IFFT | George | 7 | The Democratic Herald | 26 Mar 1856 | 3 | Orphan's Court Sale | Jackson Twp | X |
| IFFT | George | 11 | Butler County Citizen | 08 May 1872 | 2 | Mercantile Appraisal | ||
| IFFT | George | 11 | Butler County Citizen | 15 May 1872 | 2 | Mercantile Appraisal | ||
| IFFT | George | 14 | Connoquenessing Valley News | 20 Nov 1878 | 3 | Advertisement | Evansburg | X |
| IFFT | George | 16 | Zelienople News | 30 Nov 1892 | 3 | Special Bargains | Evans City | |
| IFFT | George | 16 | The Democratic Herald | 04 Mar 1898 | 3 | JP | Jackson Twp | |
| IFFT | George E. | 15 | The Keystone | 25 Dec 1883 | 4 | Returned Home | X | |
| IFFT | John | 14 | Connoquenessing Valley News | 29 May 1879 | 3 | In Business | Petersville | X |
| IFFT | John | 15 | Connoquenessing Valley News | 10 Oct 1889 | 3 | Oil Well | ||
| IFFT | John | 16 | Zelienople News | 30 Nov 1892 | 3 | Proprietor | Zelienople | |
| IFFT | L. N. | 16 | Connoquenessing Valley News | 28 Nov 1899 | 1 | Visiting | Evans City | |
| IFFT | Lew | 14 | Connoquenessing Valley News | 27 Nov 1878 | 3 | Mumps | Evansburg | |
| IFFT | Lewis J. | 15 | Connoquenessing Valley News | 06 Mar 1890 | 3 | Leaving | X | |
| IFFT | Margaret | 10 | American Citizen | 20 Apr 1870 | 2 | Married | ||
| IFFT | Miss Leona | 15 | Connoquenessing Valley News | 20 Mar 1890 | 3 | Clerk | Evans City | X |
| IFFT | Miss Lona | 15 | Connoquenessing Valley News | 13 Feb 1890 | 3 | Fire | X | |
| IFFT | Sarah | 15 | Connoquenessing Valley News | 19 Feb 1891 | 3 | Marriage License | Jackson Twp. | |
| IFFT | William | 16 | Zelienople News | 30 Nov 1892 | 3 | Public Property Sold | Zelienople | |
| IFFT | George | 11 | The Democratic Herald | 29 Mar 1871 | 2 | Official | ||
| ILAND | Rhoda | 13 | Parker City Daily | 06 Dec 1875 | 3 | Fire Limits | ||
| ILGENFRITZ | Elizabeth | 7 | The Missionary | 23 Jun 1859 | 2 | Contribution | ||
| ILGENFRITZ | George | 7 | The Missionary | 23 Jun 1859 | 2 | Contribution | ||
| ILLEGAL LIQUOR SALES | Guilty parties | 10 | American Citizen | 02 Nov 1870 | 2 | List | ||
| ILLING | Dr. Carl | 8 | The Union Herald | 10 Sep 1864 | 3 | Advertisement | ||
| IMAN | Art | 16 | The Butler County Observer | 27 June 1901 | 1 | Visiting | Callery | |
| IMAN | Harry | 16 | The Democratic Herald | 21 Jan 1898 | 1 | Suit Filed | X | |
| IMAN | Mrs. J. | 7 | The Democratic Herald | 13 Jan 1858 | 3 | Unclaimed Mail | ||
| IMAN | Thomas | 16 | The Democratic Herald | 04 Feb 1898 | 1 | Verdict | ||
| IMBACH | Frank | 14 | Parker City Daily | 13 May 1876 | 3 | Gardener | Millerstown | |
| IMBRIE | Roy | 16 | The Democratic Herald | 15 Apr 1898 | 4 | Butler Presbytery | ||
| IMM?RE?TT | John | 11 | The Democratic Herald | 10 May 1871 | 3 | Notice | ||
| IMMUS | W. A. | 14 | Parker City Daily | 04 Sep 1876 | 3 | Donation | ||
| IMPSON | Mary M. | 1 | The Butler Sentinel | 25 Oct 1823 | 3 | Marriage | Donegal Twp | |
| IMUS | W. A. | 13 | Parker City Daily | 18 Oct 1875 | 3 | Accident | ||
| IMUS | W. A. | 13 | Parker City Daily | 13 Mar 1876 | 3 | Parker Exchange | ||
| IMUS | W. H. | 14 | Parker City Daily | 25 May 1876 | 3 | Telegraph Officer | Millerstown | |
| INC. OF BUTLER BOROUGH | 6 | Democratic Herald | 12 Jan 1853 | 3 | ||||
| INDICTMENTS | Grand Jury | 10 | American Citizen | 25 Oct 1871 | 2 | List | ||
| INGERSOL | A. E. | 16 | The Democratic Herald | 18 Feb 1898 | 1 | Administrator | ||
| INGERSOL | H. | 13 | Parker City Daily | 20 Nov 1875 | 3 | Adultery Charge | Millerstown | |
| INGERSOLL | Bob | 14 | Connoquenessing Valley News | 06 Mar 1879 | 3 | Lecture | ||
| INGERSOLL | H. D. | 13 | Parker City Daily | 08 Jan 1876 | 3 | Letter | Petrolia | |
| INGERSOLL | H. D. | 14 | Parker City Daily | 10 May 1876 | 3 | Meat Market | ||
| INGERSOLL | Ham. | 14 | Parker City Daily | 08 Jul 1876 | 3 | Advertisement | Millerstown | |
| INGERSOLL | Mrs. C. P. | 14 | Parker City Daily | 08 Jul 1876 | 3 | Drowned | ||
| INGHAM | Joseph H. | 14 | Parker City Daily | 30 Jun 1876 | 3 | New Patent | Knoxville | |
| INGLE | J. C. | 14 | Parker City Daily | 26 Jun 1876 | 3 | In Town | Parker city | |
| INGLEHART | Nicholas | 11 | Butler County Citizen | 03 Apr 1872 | 2 | Notice | ||
| INGLEHART | Nicholas | 11 | Butler County Citizen | 10 Apr 1872 | 3 | Court | ||
| INGLEHART | Nicholas | 11 | Butler County Citizen | 17 Apr 1872 | 3 | Court | ||
| INGLEHART | Nicholas | 11 | Butler County Citizen | 24 Apr 1872 | 3 | Court | ||
| INGLEHART | Nicholas | 11 | Butler County Citizen | 01 May 1872 | 3 | Court | ||
| INGLEHART | Nicholas | 11 | Butler County Citizen | 08 May 1872 | 3 | Court | ||
| INGLEHART | Nicholas | 11 | Butler County Citizen | 15 May 1872 | 4 | Court | ||
| INGLEHART | Nicholas | 11 | Butler County Citizen | 29 May 1872 | 4 | Court | ||
| INGLEHART | Nicholas | 11 | Butler County Citizen | 05 Jun 1872 | 4 | Court | ||
| INGLESIDE | Jean | 11 | The Democratic Herald | 29 Mar 1871 | 1 | Poem | ||
| INGRAHAM | Angelina | 7 | The Democratic Herald | 21 May 1856 | 3 | Caution | ||
| INGRAM | Henry | 7 | The Democratic Herald | 14 May 1856 | 2 | Caution | X | |
| INMAN | Mary E. | 14 | Connoquenessing Valley News | 18 Sep 1879 | 2 | Orphans' Court | Karns City | |
| INNGST | Wm. | 1 | The Butler Centinel | 24 Apr 1821 | 3 | List of Letters | Harmony | X |
| INNIS | G. W. | 13 | Parker City Daily | 24 Sep 1875 | 3 | Committee | ||
| INNIS | W. J. | 13 | Parker City Daily | 30 Oct 1875 | 3 | Machine Works Fire | Oil City | |
| IRELAND | L. N. | 15 | Connoquenessing Valley News | 23 Apr 1891 | 2 | Property Transfer | Petrolia | |
| IRELAND | Lew. | 14 | Parker City Daily | 03 Jun 1876 | 3 | Election Results | ||
| IRISH | Nathan | 1 | The Tree of Liberty | 29 Jul 1806 | 3 | Turnpike Road | Allegheny County | |
| IRONMONGER | Charles | 14 | The Butler Citizen | 16 Nov 1881 | 2 | Register's Notice | Karns City | |
| IRONMONGER | Edward | 14 | The Butler Citizen | 16 Nov 1881 | 2 | Register's Notice | Karns City | |
| IRONS | Miss Agnes | 14 | Connoquenessing Valley News | 27 Mar 1879 | 2 | Teacher | ||
| IRONS | Mrs. Agnes K. | 8 | The Butler Union Herald | 18 May 1864 | 3 | Appraisement List | Muddycreek Twp | |
| IRONS | Rev. Andrew | 8 | The Butler Union Herald | 18 May 1864 | 3 | Appraisement List | Muddycreek Twp | |
| IRVIN | Angelina | 8 | The Butler Union Herald | 30 Mar 1864 | 3 | Estate | ||
| IRVIN | Belle S. | 16 | The Democratic Herald | 01 Jul 1898 | 5 | Graduate | ||
| IRVIN | Charles S. | 11 | East Brady Independent | 04 Mar 1871 | 5 | Advertisement | ||
| IRVIN | Dr. William | 16 | The Democratic Herald | 15 Apr 1898 | 1 | Death Notice | Evans City | |
| IRVIN | Dr. Wm. | 14 | The Butler County Citizen | 19 Jan 1876 | 2 | Chairman | ||
| IRVIN | Edward | 3 | Butler Repository | 22 Jul 1837 | 3 | Letter | Butler PO | |
| IRVIN | Edward | 8 | The Union Herald | 27 Aug 1862 | 2 | Capt. Anderson's Company | ||
| IRVIN | Elizabeth Fife | 16 | The Democratic Herald | 15 Apr 1898 | 1 | Widow | ||
| IRVIN | F. C. | 16 | The Democratic Herald | 15 Apr 1898 | 1 | Inheritance | ||
| IRVIN | J. D. | 11 | Butler County Citizen | 24 Dec 1873 | 2 | Court | ||
| IRVIN | J. D. | 11 | Butler County Citizen | 07 Jan 1874 | 2 | Court | ||
| IRVIN | Jas | 14 | Connoquenessing Valley News | 20 Feb 1879 | 3 | Nominated | East Brady | |
| IRVIN | Jas. | 15 | Connoquenessing Valley News | 17 Jan 1884 | 3 | Death Notice | ||
| IRVIN | John | 2 | The Repository | 15 Oct 1836 | 3 | Unclaimed Letter | Butler Borough | |
| IRVIN | John | 7 | The Democratic Herald | 09 Jul 1856 | 3 | Petitions | ||
| IRVIN | John | 8 | The Butler Union | 21 May 1861 | 3 | List of "Venders" | Winfield Twp | X |
| IRVIN | John | 8 | The Butler Union Herald | 30 Mar 1864 | 3 | Estate | ||
| IRVIN | John | 14 | Karns City Telephone | 17 Sep 1881 | 3 | Rebuilding | Fairview | |
| IRVIN | John | 15 | Connoquenessing Valley News | 17 Jan 1884 | 3 | Death Notice | ||
| IRVIN | John | 16 | The Democratic Herald | 15 Apr 1898 | 1 | Son | ||
| IRVIN | John W. | 8 | The Butler Union | 07 May 1861 | 2 | Evansburgh Independent Blues | Evansburg | |
| IRVIN | Lizzie M. | 15 | Connoquenessing Valley News | 09 Apr 1891 | 2 | Marriage License | Evans City | |
| IRVIN | Martin | 8 | The Butler Union | 11 Jun 1861 | 3 | Sheriff's Sales | Winfield Twp | |
| IRVIN | Miss Lillie | 13 | Butler Eagle | 16 Aug 1876 | 3 | Teacher | ||
| IRVIN | Richard | 16 | The Democratic Herald | 15 Apr 1898 | 1 | Father | Adams Twp | |
| IRVIN | S. B. | 15 | Connoquenessing Valley News | 14 Aug 1884 | 2 | Jury List | Adams Twp | |
| IRVIN | S. P. | 11 | The Democratic Herald | 15 Feb 1871 | 2 | Letter | ||
| IRVIN | S. P. | 8 | The Union Herald | 30 Jul 1862 | 3 | Mass Meeting | X | |
| IRVIN | S. P. | 13 | Butler Eagle | 16 Aug 1876 | 1 | Borough Officers | Butler | |
| IRVIN | S. P. | 14 | Butler Citizen | 14 May 1879 | 3 | Decoration Day | X | |
| IRVIN | Saml. P. | 8 | The Butler Union | 01 Oct 1861 | 3 | Advertisement | ||
| IRVIN | Samuel P. | 7 | The Democratic Herald | 20 May 1857 | 3 | Announcement | Franklin Twp | X |
| IRVIN | Squire | 15 | The Semi-Monthly | 01 Jan 1883 | 5 | Marriage | ||
| IRVIN | Tillie | 11 | American Citizen | 24 Jan 1872 | 2 | Marriage Notice | ||
| IRVIN | William | 11 | The Democratic Herald | 29 Mar 1871 | 2 | Official | Dr | |
| IRVIN | William | 11 | Zieglers Democratic Herald | 12 Feb 1874 | 4 | Letter | Dr | |
| IRVIN | William | 13 | Butler Eagle | 16 Aug 1876 | 2 | Candidate | Forward Twp | |
| IRVIN | Wm. | 14 | Parker City Daily | 03 Jun 1876 | 3 | Election Results | ||
| IRVIN | 12 | Parker City Daily | 13 Mar 1875 | 3 | Interest | |||
| IRVIN, ESQ. | Martha J. | 8 | The Butler Union | 02 Apr 1861 | 3 | Marriage | Evansburg | |
| IRVINE | A. C. | 15 | Connoquenessing Valley News | 06 Mar 1890 | 3 | Elected | Worth Twp. | |
| IRVINE | A. C. | 16 | The Butler County Record | 22 Mar 1900 | 3 | Appointed | Mars | |
| IRVINE | Cynthia | 14 | The Democratic Herald | 22 Feb 1882 | 4 | Executor's Notice | Adams Twp | |
| IRVINE | Dr. Wm. | 14 | The Democratic Herald | 22 Feb 1882 | 4 | Administrator's Notice | Franklin Twp | |
| IRVINE | Dr. Wm. | 15 | Connoquenessing Valley News | 19 Sep 1889 | 3 | Visiting | Evans City | |
| IRVINE | Ekin | 1 | The Butler Democrat | 15 Nov 1813 | 3 | Sheriff's Sale | Cranberry Twp. | |
| IRVINE | J. M. | 16 | The Democratic Herald | 18 Feb 1898 | 5 | Examination Proctors | West Sunbury | |
| IRVINE | J. Q. A. | 14 | Connoquenessing Valley News | 10 Jul 1879 | 3 | Academy | Evansburg | X |
| IRVINE | John | 1 | The Butler Democrat | 15 Nov 1813 | 3 | Sheriff's Sale | Cranberry Twp. | X |
| IRVINE | John | 15 | Connoquenessing Valley News | 27 Feb 1890 | 3 | Elected | ||
| IRVINE | Miss Lizzie | 14 | Connoquenessing Valley News | 05 Feb 1880 | 3 | Marriage | Evansburg | |
| IRVINE | V. K. | 16 | The Democratic Herald | 02 Sep 1898 | 2 | Principal | ||
| IRVINE | William | 1 | The Butler Democrat | 15 Nov 1813 | 3 | Sheriff's Sale | Cranberry Twp. | X |
| IRWIN | Alexander | 1 | The Butler Centinel | 19 Jun 1821 | 3 | Meeting of Delegates | Allegheny County | |
| IRWIN | Charles | 10 | American Citizen | 14 Dec 1870 | 2 | Married | ||
| IRWIN | David | 1 | The Butler Centinel | 10 Apr. 1821 | 3 | Death Notice | ||
| IRWIN | Dr. | 14 | Connoquenessing Valley News | 31 Jul 1879 | 3 | Wheat Harvest | Evansburg | |
| IRWIN | Dr. | 14 | Parker City Daily | 12 May 1876 | 3 | In Town | Millerstown | |
| IRWIN | Dr. John H. | 1 | The Butler Centinel | 11 May 1822 | 3 | List of Letters | Woodsville | |
| IRWIN | Dr. W. | 13 | Butler Eagle | 16 Aug 1876 | 3 | Advertisement | ||
| IRWIN | Dr. W. | 15 | The Semi-Monthly | 15 Jan 1883 | 2 | Elected | ||
| IRWIN | Geo. | 14 | Parker City Daily | 21 Jun 1876 | 3 | Torpedo Man | ||
| IRWIN | George | 13 | Parker City Daily | 06 Oct 1875 | 3 | Judge | Titusville | |
| IRWIN | George B. | 14 | Connoquenessing Valley News | 11 Sep 1879 | 2 | List of Jurors | Venango Twp | |
| IRWIN | Guyan M. | 11 | Butler County Citizen | 27 Mar 1872 | 2 | Accident | ||
| IRWIN | J. A. | 14 | Connoquenessing Valley News | 13 Sep 1883 | 3 | Roll of Honor | Evans City | |
| IRWIN | J. W. | 11 | Butler County Citizen | 10 Sep 1873 | 6 | Notice | ||
| IRWIN | J. W. | 11 | Butler County Citizen | 24 Dec 1873 | 4 | Director | ||
| IRWIN | James | 1 | The Tree of Liberty | 29 Jul 1806 | 4 | List of Causes | Court of Common Pleas | |
| IRWIN | James | 14 | Parker City Daily | 09 Aug 1876 | 3 | Guest | Pittsburgh | |
| IRWIN | James | 15 | Connoquenessing Valley News | 01 May 1890 | 3 | Injury | Rochester | |
| IRWIN | Jas. | 14 | Connoquenessing Valley News | 27 Mar 1879 | 2 | Purchased Interest | East Brady | X |
| IRWIN | Jas. | 14 | Connoquenessing Valley News | 17 Apr 1879 | 3 | Filling Lot | East Brady | |
| IRWIN | John | 8 | The Union Herald | 16 Jul 1862 | 1 | Fair Committee | Forward Twp | |
| IRWIN | John | 11 | Butler County Citizen | 02 Sep 1874 | 2 | Court | ||
| IRWIN | John | 16 | The Democratic Herald | 06 May 1898 | 5 | Land Transfers | Slippery Rock | |
| IRWIN | John W. | 16 | The Democratic Herald | 20 May 1898 | 1 | Death Notice | Slippery Rock | X |
| IRWIN | Katherine | 16 | The Democratic Herald | 01 Jul 1898 | 5 | Graduate | ||
| IRWIN | Margaret U. | 11 | Butler County Citizen | 02 Sep 1874 | 3 | Court | ||
| IRWIN | Miss Maggie | 14 | Connoquenessing Valley News | 12 Feb 1880 | 2 | Roll of Honor | Evansburg | |
| IRWIN | Pvt D. H. | 8 | The Butler Union | 17 Sep 1861 | 2 | Company Roll | ||
| IRWIN | R. I. | 13 | Parker City Daily | 08 Jan 1876 | 3 | Letter | Petrolia | |
| IRWIN | Reuben | 8 | The Butler Union | 22 Jul 1863 | 3 | Drafted | Marion Twp | |
| IRWIN | S. D. | 14 | Parker City Daily | 01 Jul 1876 | 3 | On Ticket | Forest County | |
| IRWIN | Samuel | 11 | Butler County Citizen | 02 Sep 1874 | 2 | Court | ||
| IRWIN | Samuel | 11 | Butler County Citizen | 02 Sep 1874 | 2 | Court | ||
| IRWIN | Samuel | 14 | The Butler Citizen | 08 Jun 1881 | 3 | County Convention | Centre Twp | |
| IRWIN | T. J., Captain | 4 | Butler Intelligencer | 18 Jul 1840 | 1 | July 4 Celebration | Evansburg | |
| IRWIN | W. | 11 | Butler County Citizen | 08 May 1872 | 2 | Mercantile Appraisal | Dr | |
| IRWIN | W. | 11 | Butler County Citizen | 15 May 1872 | 2 | Mercantile Appraisal | Dr | |
| IRWIN | William | 11 | The Democratic Herald | 19 Apr 1871 | 2 | Official | Dr | |
| IRWIN | William | 11 | Butler County Citizen | 17 Apr 1872 | 2 | Politics | Dr | |
| IRWIN | William | 11 | Butler County Citizen | 24 Apr 1872 | 2 | Politics | Dr | |
| IRWIN | William | 11 | Butler County Citizen | 01 May 1872 | 2 | Politics | ||
| IRWIN | William | 11 | Butler County Citizen | 08 May 1872 | 2 | Politics | ||
| IRWIN | William | 11 | Butler County Citizen | 15 May 1872 | 2 | Politics | ||
| IRWIN | William | 11 | Butler County Citizen | 29 May 1872 | 2 | Politics | Dr | |
| IRWIN & ROBISON | 4 | Butler Intelligencer | 21 Mar 1840 | 3 | List of Causes | Trial | ||
| Irwin, Esq. | S. P. | 13 | Parker City Daily | 17 Sep 1875 | 3 | Inflation | Butler | |
| IRWINE | James | 2 | Butler Sentinel | 15 Mar 1828 | 1 | Arrears of Taxes | Cranberry Twp | |
| ISAMAN | Andrew | 13 | Parker City Daily | 05 Jan 1876 | 3 | Adjourned Court | ||
| ISBAN | Charley | 13 | Parker City Daily | 15 Sep 1875 | 3 | Collecting Tour | Titusville | |
| ISEMAN | S. M. | 15 | Connoquenessing Valley News | 18 Jul 1889 | 3 | Visiting | ||
| ISETT | Frank B. | 11 | The Democratic Herald | 29 Mar 1871 | 3 | Death | ||
| ISRAEL | Charles E. | 1 | The Butler Centinel | 19 Jun 1821 | 3 | Meeting of Delegates | Allegheny County | |
| ISRAEL | Mary | 2 | Butler Sentinel | 26 July 1828 | 3 | Sheriff's Sales | Middlesex Twp. | |
| ISRAEL | Mary R. | 2 | Butler Sentinel | 06 Mar 1830 | 3 | Sheriff's Sale | Middlesex Twp. | |
| ITATTIGAN | Mrs. A. | 15 | Connoquenessing Valley News | 28 Nov 1889 | 3 | Court Proceedings | ||
| IVEL | Robert | 16 | The Democratic Herald | 20 May 1898 | 4 | Jury List | Marion Twp | |
| IVES | Brayton | 14 | Parker City Daily | 06 May 1876 | 3 | Visiting | ||
| IVES | Charles J. | 14 | Connoquenessing Valley News | 06 Feb 1879 | 3 | Killed | Bradford | |
| IVES | H. | 16 | Connoquenessing Valley News | 03 Jul 1896 | 3 | Real Estate Transfers | Oakland Twp | |
| IVES | H. S. | 13 | Parker City Daily | 13 Mar 1876 | 3 | Parker Exchange | ||
| IVORY | R. | 14 | Semi-Monthly | 01 Oct 1882 | 3 | Admitted to Bar | ||