Mary was from Lancaster, MA and most probably was born there.

From the fact that the birth of John and Mary's oldest child is recorded in Lancaster, and those of the others in Bolton, it appears probable that they settled in that part of Lancaster which, in 1738, became the town of Bolton [Carter, p. 153].

Mary was John's first wife.

This record of Mrs. Whitcomb's death is from Bolton town records: "Mary, wife of John Whitcomb, died Feb. 3, 1743, in her 25th year."