One source has Mabel born in 1751, in which case she may have been born in Salisbury.

— born in Salisbury, Litchfield Co., CT:
  2.  Noah CHITTENDEN, b. 26 Oct 1753 
  3.  Mary CHITTENDEN, b. 1754 
  4.  Hannah CHITTENDEN, b. 13 Jul 1756 
  5.  Elizabeth "Betsy/Betty" CHITTENDEN, b. 17 Feb 1761; m. James HILL
  6.  Beulah M. CHITTENDEN, b. 15 May 1764 
  7.  Martin CHITTENDEN, b. 12 Mar 1763/6; d. 5 Sep 1840, Williston, Chittenden Co., VT; m. Anna BENTLEY
  8.  Giles CHITTENDEN, b. 30 Jul 1768/9; d. Mar 1819; m. Mary "Polly" HAWLEY
  9.  Truman A. CHITTENDEN, b. 3 Aug 1770; d. 5 Sep 1840, Williston, Chittenden Co., VT; m. Lucy JONES
10.  Electa CHITTENDEN, b. 27 Jul 1773/4; m. Jacob SPOFFORD

Did both Martin and Truman really die on the same day and in the same place?

1.  Frederick Adams Virkus, ed.  1933.  The Compendium of American Genealogy.  Institute of American Genealogy, Chicago (1968 by Genealogical Publ. Co., Baltimore; Broderbund CD-200).  In v. 6, on p. 292:

1-HERRICK, George Ira, b nr. Wheaton, Ill., June 11, 1868... 10-William Chittenden (qv); 9-Thomas (d 1683), Guilford, Conn.; m Joanna Jordan (John10, m Anna--); 8-William (1666-1738), m 1st, Hannah-- (d 1703); 7-Ebenezer (1699-1756), East Guilford; m 1723, Mary Johnson (1699-1779; Sam.8, m Mary Sage; Wm.9; Robt.10); 6-Lt. Col Thomas (1730-97), to Salisbury, Conn., 1751; dep. Gen. Ct. of Conn.; to Vt., 1774; 1st gov. of the Independent Republic of Vt. 14 yrs., and gov. of state 6 yrs.; 1st pres. Com. Safety, Bennington; State of Vt. erected granite monument to his memory; m 1749, Elizabeth Meigs (1731-1817; Lt. Janna7, m Elizabeth, dau. Ebenr. Dudley; Capt. Janna8; Dea. John9; John10; Vincent12, qv); 5-Mabel (1750-1838), m Capt. Thomas Barney (1745-1828), Jericho, Vt.; with the "Green Mtn. Boys," Am.Rev.; 4-Mabel (177--1844), m Ezra Galusha (4 above)...

2.  Alvan Talcott.  1882.  Chittenden Family:  William Chittenden of Guilford, Conn., and His Descendants.  Tuttle, Morehouse & Taylor, New Haven, CT.

Gov. Thomas Chittenden, son of Ebenezer, removed from Guilford at the age of 21 to Salisbury, in Litchfield County, then in its first settlement, where he was prosperous In business, and a prominent man in the community, sustaining important civil and military offices.  In 1773, he removed again to what was then called the New Hampshire Grants, now the state of Vermont.  He purchased a large tract of land on Onion River, then a wilderness, which took the name of Williston.  Here he began a settlement with brilliant prospects, til the war of Revolution commenced, when he was driven from his home to a place less exposed to the enemy.  He was a leading man in the measures taken to form a separate government for the State of Vermont, and in 1778 was chosen as its first Governor, which office he held with the exception of one year until his death. Gov. Chittenden possessed in an eminent degree precisely those qualities that fitted him for the place in which he was called to act.  He had not, indeed, enjoyed many of the advantages of education, but his want of education was amply supplied by the possession of a strong and active mind, which, at the time when he immigrated to Vermont, was matured by age, practiced in business, and enriched by a careful observation of men and things.  His knowledge was practical, rather than theoretical.  He was regular in his habits, plain and simple in his manners, averse to ostentation in equipage or dress, and he cared little for the luxuries, blandishments and etiquette of refined society. Though he was deficient in many of the qualities now deemed essential in a statesman, he possessed all that was necessary in the times in which he lived, and was probably far better fitted to be the leader and governor of the independent, dauntless and hardy, but uneducated, settlers of Vermont, than would have been a man of greater theoretic knowledge and more political accomplishments. He married in 1750, Elizabeth Meigs, dau. of Janna Meigs and Elizabeth Dudley, of East Guilford, sister of his brother Ebenezer's wife.

3.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).

4.  Broderbund.  World Family Trees.  Vol. 15, Pedigree No. 568.