Rockdale’s post office opened in 1873, and 1 of its places is on the National Register
More historic than 30% of U.S. towns · #241 of 642 in Texas. What drives it
Its Register listing is the International & Great Northern Railroad Passenger Depot. Most of Rockdale was built recently: 1% of its homes predate 1940 and the median home dates from 1977. Below: maps from 1885 on and the census since 1880.
Founding year: the first Rockdale post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Rockdale’s History grade
On its age, its old homes and the National Register, Rockdale is more historic than 30% of U.S. towns, #241 of 642 in Texas. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
C
HistoryA character grade: shown, never part of Rockdale’s overall grade.
Few Texas towns list much on the Register (a typical Texas town has 0.0 per 10,000 residents, the U.S. 2.4), so Rockdale’s 1.8 sits above most of its state (75% of Texas towns have fewer) while its 1 listings outnumber those of 51% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from D to B−. The pre-1940 share (±1.6 points) is firm at this size. The founding year is the first post office, not a stated founding date.
Founding year: the first post office (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 Rockdale’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
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.
1885Sheet 1 of 1
Edition
Sheets
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Sanborn Map Company, via the Library of Congress. Editions published in 1930 or earlier, which are in the public domain.
As a passing point of the "Camino Real" and the establishment of three missions in the area, a wooden fort was established on the south bank of the San Xavier River, to protect those missions, circa 1751. The fort was called San Francisco Xavier de Gigedo Presidio.[1][2]In 1873, the town developed as the International-Great Northern Railroad came through the area. Rockdale was named for a nearby rock that stood 12 feet high and had a circumference of 20 feet. Rockdale was incorporated in 1878. The rock's location was subsequently lost, and is believed to be north of the city limits.
The Rockdale post office opened in 1873, the earliest record of the town by name (U.S. post office records).
How does Rockdale rank for history?
Rockdale is more historic than 30% of U.S. towns, #241 of 642 in Texas. 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 Rockdale?
One place: the International & Great Northern Railroad Passenger Depot (listed 2006).
How old are the homes in Rockdale?
1% of Rockdale’s homes were built before 1940 (Census estimate, ±1.6 points), against a typical 1.6% for a Texas 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 (6), the National Register of Historic Places (1), 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.
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