Wyomissing is a borough in Berks County, Pennsylvania, United States, established on July 2, 1906. The population was 8,587 at the 2000 census, but after the January, 2002 merger with neighboring Wyomissing Hills, the combined 2000 Census estimate was 11,155 making it the most populous borough in Berks County. The borough is recognized as a Tree City USA and selected as a "Contender" for the best places to live in Pennsylvania by Money magazine.
Wyomissing is located at 40°19′58″N 75°57′53″W / 40.33278°N 75.96472°W / 40.33278; -75.96472 (40.332742, -75.964603).
According to the United States Census Bureau, the borough has a total area of 3.8 square miles (9.9 km²), of which, 3.8 square miles (9.9 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.52%) is water.