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History · Mill Plain

Mill Plain’s post office opened in 1826, and 14% of its homes were built before 1940

1 place in town is on the National Register. Below: maps from 1892 on.

1826first post office
1on the National Register
14%homes built before 1940
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Quick answers

How Mill Plain began

When was Mill Plain founded?

1826

The Mill Plain post office opened in 1826, the earliest record of the town by name.

2020 census: 1,654200 years
Founding year: the first Mill Plain post office (Blevins & Helbock, CC0).

What stands out about Mill Plain’s past

Read from the archive, the National Register and the record. The page puts what stands out first.

A history waiting to be writtenNo old photos of Mill Plain are in the public archives yet. The rest are in attics and albums.On the map since 18924 editions of the USGS map, 1892 to 1971. Watch Mill Plain change.Deep rootsA post office since 1826: 200 years of Mill Plain.Old housesHalf of Mill Plain’s homes were built before 1958.
★ What stands out · Help out

Start Mill Plain’s collection

The first neighbors to add old photos shape how Mill Plain’s history is told.

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
Share a family photoSign in to add one+10
On the map

Mill Plain on the map, 1892 to 1971

Every edition of the U.S. Geological Survey’s map of Mill Plain. Tap a year, or press play to watch the town change.

Mill Plain on the 1892 USGS mapMill Plain on the 1951 USGS mapMill Plain on the 1960 USGS mapMill Plain on the 1971 USGS map1892Norwalk 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 Mill Plain.

The story so far

Mill Plain, in brief

Wikipedia doesn’t have a history of Mill Plain yet. The photos, dates and memories neighbors add here are how it gets written.

Mill Plain is a census-designated place (CDP) in the town of Fairfield, Fairfield County, Connecticut, United States. It is in the southern part of the town, directly north of the downtown area of Fairfield and northeast of Southport. It is bordered to the west by the Mill River, to the south by Interstate 95, to the east by Mill Plain Road, and to the north by Duck Farm Road. Mill Plain was first listed as a CDP prior to the 2020 census.

Its first post office opened in 1826.

Intro from Wikipedia. Population: U.S. Census Bureau.

By decade

No old photos in the archives yet

Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.

Be the first to add onePhotograph a print flat, in daylight, no flash.
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On the National Register

1 historic place in Mill Plain

The country’s official list of buildings and places worth saving. One is a National Historic Landmark, the highest tier.

place listed
1
National Historic Landmark
1
none yet
historic buildings protected
3
each building in a district counts

National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.

Famous people

Famous people close to Mill Plain

Nobody well known was born in Mill Plain itself, so here are the best known from just nearby.

See all →
M
Meg RyanAmerican actress · b. 1961
Robert MitchumAmerican actor · b. 1917
John MayerAmerican musician · b. 1977
Charli D'AmelioAmerican social media personality · b. 2004
George SmithNobel prize winning US chemist · b. 1941
Brian DennehyAmerican actor · b. 1938
Stories next door

History across the town line

Each neighbor’s History grade, on the same three inputs.

Southport3 historic placesnot graded: under 1,000 residents or part of its town

Questions about Mill Plain’s history

What year was Mill Plain founded?

The Mill Plain post office opened in 1826, the earliest record of the town by name (U.S. post office records).

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
Start a conversation
Sources

Where this page comes from

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). How TownRatings grades history →

From U.S. Geological Survey historical maps. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.