Waterloo, Oregon

Waterloo, Oregon
Historic stereoscope image of the Santiam River at Waterloo
Location in Oregon
Coordinates: 44°29′41″N 122°49′27″W / 44.49472°N 122.82417°W / 44.49472; -122.82417
CountryUnited States
StateOregon
CountyLinn
Incorporated1893
Government
 • MayorJustin Cary
Area
 • Total
0.12 sq mi (0.31 km2)
 • Land0.12 sq mi (0.31 km2)
 • Water0 sq mi (0.00 km2)
Elevation
404 ft (123 m)
Population
 (2020)
 • Total
222
 • Density1,830.4/sq mi (706.72/km2)
Time zoneUTC-8 (Pacific)
 • Summer (DST)UTC-7 (Pacific)
ZIP code
97355
Area codes458 and 541
FIPS code41-79050
GNIS feature ID2413454

Waterloo is a city in Linn County, Oregon, United States. The population was 229 at the 2010 census.

The city's name, a joking reference to the Battle of Waterloo, stemmed from a 19th-century court decision that settled a land dispute at Kees Mill along the South Santiam River. After the dispute ended, Kees Mill became known as Waterloo.

The federal government established a post office at Waterloo on January 5, 1875. S. D. Granger was its first postmaster. The post office closed in 1974.