Ayer dates to 1668, and 21% of its homes were built before 1940
More historic than 87% of U.S. towns · #168 of 283 in Massachusetts. What drives it
4 places in town are on the National Register, among them a historic district with 12 buildings. Below: 14 old photos and papers, maps from 1887 on, and the census since 1900.
Founding year: Wikidata. First post office: 1849.The full story ↓
History grade
What drives Ayer’s History grade
On its age, its old homes and the National Register, Ayer is more historic than 87% of U.S. towns, #168 of 283 in Massachusetts. All 3 inputs are above most U.S. towns; its age ranks highest and its National Register listings lowest.
A
HistoryA character grade: shown, never part of Ayer’s overall grade.
Massachusetts towns list more on the Register than most of the country (a typical Massachusetts town has 46.0 per 10,000 residents, the U.S. 2.4), so Ayer’s 17.4 sits below most of its state (34% of Massachusetts towns have fewer) while its 15 historic buildings outnumber those of 78% of U.S. towns.
NoteThe founding year comes from Wikidata alone; no second source gives 1668.
How sure. Graded on any two of the three inputs instead, the letter would range from B+ to A. The pre-1940 share is a Census survey estimate (±4.7 points).
Founding year: Wikidata (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Ayer’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Every edition of the U.S. Geological Survey’s map of Ayer. Tap a year, or press play to watch the town change.
1893Groton sheet · 1:62,500
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Ayer.
Every building
Ayer, building by building, 1887–1921
Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.
Ayer was originally inhabited by the Nashaway, a Nipmuc people that inhabited the lands along the Nashua River and its tributaries. A small settlement was located along the banks of the Nonacoicus Brook, located in the western part of the town. The name of the Nashaway village, its people and the brook, pronounced by locals as /ˈnɒ nə ˌkɔɪ ʃəs/, was also recorded in early English sources as 'Nonajcoyjicus,' 'Nonocoyecos,' 'Nonacoiacus' and 'Nonaicoics.' According to the personal manuscripts of Justice Samuel Sewall, best known for his controversial role in the Salem witch trials, he was told sometime in 1698 by Hanah, wife of Sachem Ahaton of the Ponkapoag Massachusett tribe, that the name was actually Nunnacoquis (modern Wôpanâak Massachusett dialect Nunahkuqees /nənahkəkʷiːs/) and signified 'an Indian earthen pot' although literally refers to a 'small dry earthen pot.' The name was l…
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
In 1668, according to Wikidata. Ayer’s post office opened in 1849, and the census of 1900 counted 2,446 people here.
How does Ayer rank for history?
Ayer is more historic than 87% of U.S. towns, #168 of 283 in Massachusetts. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
What is on the National Register in Ayer?
4 listings: 3 buildings, among them the Pleasant Street School (listed 1986, the first), and 1 historic district, the Ayer Main Street Historic District, with 12 contributing buildings. 15 historic buildings in all.
How old are the homes in Ayer?
21% of Ayer’s homes were built before 1940 (Census estimate, ±4.7 points), against a typical 21% for a Massachusetts town; the median home was built in 1977.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021).
From Wikimedia Commons (26), the Library of Congress (2), Wikidata (4), the National Register of Historic Places (4), Wikipedia, Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System and Sanborn fire insurance maps (Library of Congress). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
1901–1907
1915
1918–1930
c. 1930
c. 1930
c. 1930
c. 1930
c. 1930
c. 1930
1930
1939
2026
2026
2025
2022
2021
2021
2021
2021
2021
2016
2016
2016
2013
2010