The 6-by-6-mile square T6N-R9E was first settled in 1834, and became part of Lapeer Township, organized on 30 Dec 1834, which then included most of Lapeer County. Hadley Township was then organized on 22 Mar 1836, and included both T6N-R9E and T6N-R10E. Then T6N-R10E became Metamora Township on 2 Apr 1838, leaving T6N-R9E with the current designation, Hadley Township.

The first settlers what is now Hadley Township, in 1834, were William HART, John LOOK, H. M. LOOK, Eri L. POTTER, and John L. MORSE. They settled in Sections 1 and 2, in the northeast corner of T6N-R9E. In 1835, more settlers came, and settled in Sections 3, 4, 9, and 10, where the village of Hadley gradually developed.[HRP, pp. 83-93]

The small community of Farmer's Creek can be seen in the 1863 map, a cluster of houses in the northeast part of Hadley Township, and the northwest corner of Metamora Township. It seems to have disappered by 1906.

Earliest Land Entries:

17 May 1834, John LOOK, Section 1
24 Sep 1834, John L. MORSE, Section 2
24 Sep 1834, Eri L. POTTER, Section 2
12 Nov 1834, John LOOK, Section 1

20 May 1835, Abraham TUNISON, Section 4
21 May 1835, Charles L. CAMPBELL, Section 9
26 May 1835, Giles F. GRIDLEY, Section 10
26 May 1835, Giles F. GRIDLEY, Section 15
28 May 1835, William HART, Section 9
28 May 1835, Abraham TUNISON, Section 10
6 Jul 1835, William HART, Section 9
21 Jul 1835, Timothy WHEELER, Section 1
14 Aug 1835, Minor MORSE, Section 10
27 Aug 1835, Almon GRIGGS, Section 1
12 Oct 1835, William FARRAR, Section 11
21 Oct 1835, Justus P. WHEELER, Section 4
29 Oct 1835, Eri L. POTTER, Section 2
29 Oct 1835, Trumbull CAREY, Section 3
29 Oct 1835, Abraham TUNISON, Section 4
29 Oct 1835, William HART, Section 9
2 Nov 1835, Trumbull CAREY, Section 4

Greenwood Cemetery, also known as Green Corners Cemetery, is on the NE corner of Green Corners Road and Pratt Road, in Section 5, a mile west of the village of Hadley, in the northwest corner of Hadley Township. There are 1,716 memorials on Find A Grave, with 90% photographed. The Tombstone Transcription Project also has 44 images from this cemetery. (Note: There is another Greenwood Cemetery in North Branch Township, Lapeer County.)

The Hadley Community Church Cemetery is next to the church, on the south side of Hadley village, Section 9. Find A Grave has 458 memorials for this cemetery, with 69% photographed, and the Tombstone Transcription Project has 91 images. The earliest graves are dated 1837, and there are only a few after 1930.

Rural Vale Cemetery, abandoned and possibly moved, was located in the SW corner of Section 25, on Baldwin Road, between Brauer and Brocker. Find A Grave has 8 memorials with 5 photographed. The graves date from 1854 to 1866. Surnames are BALDWIN (1), DAWSON (2), PRICE (4) and WRIGHT (1).

The Sanborn Cemetery is in Section 7, on the western edge of Hadley Township. Find A Grave has 29 memorials, of which 19 have gravestone photos, and 17 have the surname SANBORN. The dates range from 1842 to 1957.

The South Hadley Cemetery, also known as Christ Lutheran Cemetery, lies in the SE corner of Section 28, about 1/2 mile NW of Big Fish Lake. Find A Grave has 227 memorials, with 90% photographed. The earliest grave is from 1877, but many are after 2000.