Office hours
Assessor's Office
Monday and Thursday8 am to 4 pm
Official source ↗Checked Sep 14, 2026
Town guide · Newmarket
Get to know Newmarket
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The essentials
The basics
Collection days
Hours
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Good to know
ZIP code03857 Wikidata
Area code603 Wikidata
Collection days
Trash day
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Good to know
ZIP code Wikidata
03857
Area code Wikidata
603
About Newmarket
Place in New Hampshire, United States1727Established
9,430Population
14.2 sq miArea
39 ftElevation
Newmarket is a town in Rockingham County, New Hampshire, United States. The population was 9,430 at the 2020 census. Some residents are students and employees at the nearby University of New Hampshire in Durham. The densely settled center of town, where 5,797 people resided at the 2020 census, is defined as the Newmarket census-designated place and is located at the junction of New Hampshire routes 108 and 152, along the Lamprey River.
From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)
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Town essentials
Official information, kept current with help from neighbors.
Office hours
Building Safety / Health Officer
Monday through Thursday7 am to 4:15 pm
Official source ↗Checked Sep 14, 2026
Office hours
Town Clerk-Tax Collector's Office
Monday, Tuesday, Thursday7 am to 4:15 pm; FridayClosed
Official source ↗Checked Sep 14, 2026
General phone
Alert Center • Town Clerk - Tax Collectors Office Closing No
(603) 659-3617
Official source ↗Checked Sep 14, 2026
General phone
Departments
(603) 659-3617
Official source ↗Checked Sep 14, 2026