03857 Frequently Asked Questions

A: ZIP Code 03857 is Located in Newmarket New Hampshire. Portions of 03857 are also in Newmarket (town), Greenland, Newington, Stratham.

A: ZIP Code 03857 is Located Entirely in Rockingham County New Hampshire.

A: The Area Code for 03857 is 603.

A: ZIP Code 03857 is in the New Hampshire 1st Congressional District.

A: 03857 is within New Hampshire House of Representatives District Rockingham 10, New Hampshire House of Representatives District Rockingham 12, New Hampshire House of Representatives District Rockingham 21 and New Hampshire House of Representatives District Rockingham 24.

A: 03857 is within New Hampshire State Senate District 21 and New Hampshire State Senate District 24.

A: The 2022 population of ZIP Code 03857 is 9400. The population growth rate in 03857 is 4.02%.

A: The majority race/ethnicity of people residing in 03857 is White (95.09%). The majority race/ethnicity of students attending public schools in 03857 is White(85.54%).

A: The median household income in 03857 is $83,070 (2021) and the average adjusted income is $424,000 (2021).