1838 - Formed from part of Illinois Synod
Rushville, Sangamon and Mackinaw Presbyteries

Resolved, That a new Synod be stricken off from the Illinois Synod, to be known by the name of the Meheca Synod, to be composed of the following Presbyteries, viz: Rushville, Sangamon and Mackinaw -- that the first meeting be held at Rushville, Illinois on Thursday before the third Sabbath in October next; that Rev. John M. Berry be the first Moderator, and in case of his absence Rev. Abner McDowell.
[Source: Minutes of the General Assembly of the Cumberland Presbyterian Church, May 17, 1838, page 242]

1840 - Name changed to Sangamon Synod

The Committee appointed to examine the Minutes of the Meheca Synod, report; That they have discharged that duty, and find no violations of our discipline in said Minutes; but find a memorial in the minutes of 1838 praying that the name be changed to Sangamon, which memorial is hereby submitted with this report, which is adopted. And on motion, Resolved, That the prayer of the memorialists be and the same is hereby granted; passed first and second reading.
[Source: Minutes of the General Assembly of the Cumberland Presbyterian Church, May 21, 1840, page 265]

1838
October 18-20, 1838 - Rushville, Illinois
Moderator - Rev. John M. Berry
Clerk - Rev. Cyrus Haynes
Stated Clerk - Rev. Cyrus Haynes
Microfilm of manuscript minutes from the Presbyterian Historical Society (included in the manuscript volume of the Minutes of Sangamon Synod, pages 16-22)

1839
October 17-19, 1839 - Lebanon Meeting House, Menard County, Illinois
Moderator - Rev. Peter Downey
Clerk: Rev. Archibald Johnson
Stated Clerk - Rev. Cyrus Haynes
Microfilm of manuscript minutes from the Presbyterian Historical Society (included in the manuscript volume of the Minutes of Sangamon Synod, pages 22-27)