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History · Waterloo

Waterloo’s post office opened in 1865, and 26% of its homes were built before 1940

Below: maps from 1908 on and old-book passages.

1865first post office
0on the National Register
26%homes built before 1940
Quick answers

How Waterloo began

When was Waterloo founded?

1865

The Waterloo post office opened in 1865, the earliest record of the town by name.

2020 census: 534161 years
Founding year: the first Waterloo post office (Blevins & Helbock, CC0).

What stands out about Waterloo’s past

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

★ What stands out · Help out

Start Waterloo’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
On the map

Waterloo on the map, 1908 to 1968

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

Waterloo on the 1908 USGS mapWaterloo on the 1939 USGS mapWaterloo on the 1942 USGS mapWaterloo on the 1953 USGS mapWaterloo on the 1968 USGS map1908Waterloo sheet · 1:31,680

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Waterloo.

The story so far

Waterloo, in brief

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

Waterloo is a census-designated place in San Joaquin County, California. Waterloo sits at an elevation of 62 feet (19 m). The 2020 United States census reported Waterloo's population was 534.

Its first post office opened in 1865. Between the 2010 and 2020 censuses its population fell from 572 to 534 (-7%).

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

From the old history books

What they wrote about Waterloo, 1877–1893

Passages that mention Waterloo, cut from the printed page as they were published.

The duke of Wellington established his head-quarters opposite the church at Waterloo, (now the post-house and post-ofhee;) while his Imperial antagonist. Napoleon, pitched his tent near the farm of Caillou, about five miles from Waterloo, on the East-side of the Genappe road, in the parish of Old-G…
A voice from Waterloo1877 · page 23Read the page →
Read the text

The duke of Wellington established his head-quarters opposite the church at Waterloo, (now the post-house and post-ofhee;) while his Imperial antagonist. Napoleon, pitched his tent near the farm of Caillou, about five miles from Waterloo, on the East-side of the Genappe road, in the parish of Old-Genappe. The Imperial baggage was also at this farm. • Most of the houses in the villages adjacent Waterloo

Text read by machine from the scan; it may contain errors.
The difficulty with this reasoning, as it seems to us, Hes in the fact that it was not that he might be strong enough to defeat Welhngton that Napoleon needed to have all his army on the field of Waterloo, but in order to prevent his being overwhelmed by the union of the army of Bliicher to that of…
The campaign of Waterloo1893 · page 278Read the page →
Read the text

The difficulty with this reasoning, as it seems to us, Hes in the fact that it was not that he might be strong enough to defeat Welhngton that Napoleon needed to have all his army on the field of Waterloo, but in order to prevent his being overwhelmed by the union of the army of Bliicher to that of Wellington. With the army of Wellington the force Napoleon had at Waterloo was abundantly able to cope ; but against the two armies of

Text read by machine from the scan; it may contain errors.
most of his foreign contingents; and with only his English regiments and those of the King's German Legion he could not have mustered a sufficient force to justify him in accepting battle at Waterloo, even if he had been otherwise disposed to do so. In fact, one may safely conclude, that the battle…
The campaign of Waterloo1893 · page 185Read the page →
Read the text

most of his foreign contingents; and with only his English regiments and those of the King's German Legion he could not have mustered a sufficient force to justify him in accepting battle at Waterloo, even if he had been otherwise disposed to do so. In fact, one may safely conclude, that the battle of Waterloo would not have been fought had not d'Erlon's Corps been turned aside by the unauthorized act of the staff-officer. We

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

Waterloo, 1865 to 1908

Woven from the archive, old maps, post office records, the National Register and the people born here.

  1. 19th century
  2. 1865Post officeThe Waterloo post office opens
  3. 1875Post officeThe Waterloo post office closes
  4. 20th century
  5. 1908On the mapFirst mapped by the U.S. Geological Survey
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.

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Famous people

Famous people close to Waterloo

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

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Places that used to be

Lost post offices

Waterloo had its own post office from 1865 to 1875.

Waterloo
1865–1875
18601940today

US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).

Questions about Waterloo’s history

What year was Waterloo founded?

The Waterloo post office opened in 1865, the earliest record of the town by name (U.S. post office records).

Memory lane

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

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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, the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System 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.