John married Catherine Anne Drenning Drennan on 24 Mar 1785 in Bedford County, Pennsylvania, United States. Catherine (daughter of Samuel Drenning Drennan and Anne Baxter) was born on 25 Jan 1769 in Bedford County, Pennsylvania, United States; died on 22 Feb 1862 in Connersville, Fayette, Indiana, United States; was buried in Connersville, Fayette, Indiana, United States. [Group Sheet] [Family Chart]

1. Sarah McCormick was born on 22 Apr 1786 in Bedford County, Pennsylvania, United States; died about 1850 in Delaware County, Indiana, United States.
2. Anna McCormick was born on 6 Sep 1787 in Bedford County, Pennsylvania, United States; died on 23 Jan 1880 in Grant County, Indiana, United States; was buried in McCormick Cemetery, Fairmount, Grant, Indiana, United States.
3. Samuel McCormick was born on 23 Sep 1789 in Bedford County, Pennsylvania, United States; died on 2 Jun 1867 in Hendricks County, Indiana, United States; was buried in Springhill Cemetery, Cartersburg, Hendricks, Indiana, United States.
4. John Wesley McCormick was born on 15 Sep 1791 in Bedford County, Pennsylvania, United States; died on 25 Aug 1825 in Indianapolis, Marion, Indiana, United States.
5. William N. McCormick was born on 27 Sep 1793 in Bedford County, Pennsylvania, United States; died on 14 Oct 1868 in Wheeling, Delaware, Indiana, United States.
6. Joseph McCormick was born on 7 Sep 1795 in Butler County, Ohio, United States; died on 5 Dec 1853 in Lee County, Iowa, USA.
7. James McCormick was born on 5 Dec 1797 in Butler County, Ohio, United States; died on 6 Oct 1858 in Hendricks County, Indiana, United States.
8. Elizabeth McCormick was born on 29 Mar 1800 in Butler County, Ohio, United States; and died.
9. Jane McCormick was born on 4 Jun 1802 in Butler County, Ohio, United States; died on 30 Apr 1896 in Union Township, Delaware, Indiana, United States; was buried in Mount Zion Cemetery, Union Township, Delaware, Indiana, United States.
10. Robert McCormick was born on 19 Jun 1804 in Butler County, Ohio, United States; and died.
11. Lewis McCormick was born on 9 Jun 1807 in Preble County, Ohio, United States; died on 30 Apr 1880 in Fayette County, Indiana, United States.
12. Catherine McCormick was born on 20 Dec 1808 in Preble County, Ohio, United States; died on 11 Jun 1900 in Muncie, Delaware, Indiana, United States; was buried in Near Bentonville, Fayette, Indiana, United States.
13. David McCormick was born on 24 Jun 1811 in Preble County, Ohio, United States; died on 16 Jun 1879 in Platte County, Missouri, United States.
14. Mary McCormick was born on 8 Jun 1813 in Preble County, Ohio, United States; died on 1 Nov 1815 in Connersville, Fayette, Indiana, United States.