Hanover Township’s post office opened in 1868, and 38% of its homes were built before 1940
1 place in town is on the National Register, among them the Hollenberg Pony Express Station, a National Historic Landmark. Below: 1 old photo or paper, maps from 1889 on, and the census since 1880.
Every edition of the U.S. Geological Survey’s map of Hanover Township. Tap a year, or press play to watch the town change.
1889Marysville sheet · 1:125,000
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Hanover Township.
People over time
Hanover Township, census by census
Peaked at 1,039 in 1910; 690 people lived here in 2020.
15 censuses, 1880–2020.
U.S. Census Bureau decennial counts, from the census table on Hanover Township’s Wikipedia page.
The "Hollenberg Station" became an important hub along the way for Pony Express travelers and Geret Hollenberg eventually established a grocery and stage depot on his farm in 1858. The Hollenberg farm housed nine boarding rooms, and the success of "Hollenberg Station" as a business attracted more people to the area and many settled alongside the Hollenbergs in the decade leading up to the establishment of Hanover.
Prior to the establishment of the town, in 1868 a school district was established in the area to satisfy the need to educate children of settlers who continued to arrive near the "Hollenberg Station."
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 Wikimedia Commons (1), the Library of Congress (1), the National Register of Historic Places (1), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.