On its age, its old homes and the National Register, Mercer is more historic than 92% of U.S. towns. All 3 inputs are above most U.S. towns; its share of homes from before 1940 ranks highest and its National Register listings lowest.
A
HistoryA character grade: shown, never part of Mercer’s overall grade.
Pennsylvania towns list about as much on the Register as the country (a typical Pennsylvania town has 2.1 per 10,000 residents, the U.S. 2.4), so Mercer’s 10.0 sits above most of its state (77% of Pennsylvania towns have fewer) while its 2 historic buildings outnumber those of 60% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from A− to A. The pre-1940 share is a Census survey estimate (±8.6 points). Two sources give 1803.
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 Mercer’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Peaked at 2,800 in 1960; 1,982 people lived here in 2020.
21 censuses, 1820–2020.
U.S. Census Bureau decennial counts, from the census table on Mercer’s Wikipedia page.
Every building
Mercer, building by building, 1886–1910
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.
Sanborn Map Company, via the Library of Congress. Editions published in 1930 or earlier, which are in the public domain.
The story so far
Mercer, in brief
Wikipedia doesn’t have a history of Mercer yet. The photos, dates and memories neighbors add here are how it gets written.
Mercer is a borough in Mercer County, Pennsylvania, United States, and its county seat. The population was 1,982 at the 2020 census. It is part of the Hermitage micropolitan area. The community was named after Brigadier General Hugh Mercer. The Mercer County Court House and Christiana Lindsey House are listed on the National Register of Historic Places.
Mercer was established in 1803. Its population held steady between the last two censuses: 2,002 in 2010, 1,982 in 2020.
Intro from Wikipedia. Population: U.S. Census Bureau.
From the old history books
What they wrote about Mercer, 1888–1905
Passages that mention Mercer, cut from the printed page as they were published.
A pioneer outline history of northwestern Pennsylvania, embracing the counties of Tioga, Potter, McKean, Warren, Crawford, Venango, Forest, Clarion, Elk, Jefferson, Cameron, Butler, Lawrence, and Mercer1905 · page 579Read the page →
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Mercer County was a wilderness until several years after the passage of the celebrated land law of April, 1792, providing for the survey and settlement of all the lands " north and west of the Ohio and Allegheny Rivers and Conewango Creek." Soon after peace was restored to the frontier, in 1795, settlements were made extensively about the southern end of Mercer County, in the forks of Mahoning, Shenango, and Neshannock Creeks.
Text read by machine from the scan; it may contain errors.
A pioneer outline history of northwestern Pennsylvania, embracing the counties of Tioga, Potter, McKean, Warren, Crawford, Venango, Forest, Clarion, Elk, Jefferson, Cameron, Butler, Lawrence, and Mercer1905 · page 588Read the page →
Read the text
to demand from the French an explanation of their designs in establishing military posts on the waters of the Ohio. This route left Mercer County entirely to the west, and may explain why settlements in Venango, Crawford, and Erie, which it traversed, preceded those formed in Mercer. There were no settlements made in it until after Wayne's victory over the Indians and the peace with them that followed in i~95- After this, in the fall of 1/95, the surveyors began their labors, followed closely by the first settlers. Benjamin Stokely now occupies the farm on which his father thus commenced the
Text read by machine from the scan; it may contain errors.
History of Mercer County, Pennsylvania1888 · page 1015Read the page →
Read the text
remains rest quietly in the Findley grave-yard, a mile east of Mercer. Prior to his going to the farm Samuel Pew, though but a boy ten years of age, held the first stake set in the laying out of the town of Mercer in 1803. Even three years earlier than that, viz. , 1800, he carried water for the men who built Rev. Samuel Tait’ s meeting-house, in Cool Spring Township. At that time he was about seven years of age. While the family was still living in Mercer, the Pews were intimately acquainted with the Indians living in the neighborhood. The latter frequently visited the frontier cabin and fondled the children. Among these In-
Text read by machine from the scan; it may contain errors.
History of Mercer County, Pennsylvania1888 · page 689Read the page →
Read the text
In 1872 he was operating a store at Bethel, this coiinty. One year later he began dealing in lumber and contracting. In 1882 he established his extensive lumber yard at Mercer. Since 1873 he has given his entire time to his present business, and has built many excellent buildings in Mercer County, prominent among which are the Grove City College and Orr’s Opera House at Mercer.
Text read by machine from the scan; it may contain errors.
Scans and text from the Internet Archive. Books published in 1930 or earlier, which are in the public domain.
Timeline
Mercer, 1803 to 1961
Woven from the archive, old maps, post office records, the National Register and the people born here.
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 1803, according to Wikidata. Mercer’s post office opened in 1805, and the census of 1820 counted 506 people here.
How does Mercer rank for history?
Mercer is more historic than 92% of U.S. towns. 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 Mercer?
One place: the Christiana Lindsey House (listed 1998).
How old are the homes in Mercer?
43% of Mercer’s homes were built before 1940 (Census estimate, ±8.6 points), against a typical 18% for a Pennsylvania town; the median home was built in 1947.
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 (6), the National Register of Historic Places (1), 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, Sanborn fire insurance maps (Library of Congress) and old county and town histories (Internet Archive). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
1923
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