18631 Frequently Asked Questions

A: ZIP Code 18631 is Located in Mifflinville Pennsylvania. Portions of 18631 are also in Mifflin Township (Columbia County).

A: ZIP Code 18631 is Located Entirely in Columbia County Pennsylvania.

A: The Current Sales Tax in ZIP Code 18631 is 6.0%

A: The Area Codes for 18631 are 272 and 570

A: ZIP Code 18631 is in the Pennsylvania 9th Congressional District.

A: ZIP Code 18631 is in Pennsylvania State House of Representatives District 109.

A: ZIP Code 18631 is in Pennsylvania State Senate District 27.

A: The 2022 population of ZIP Code 18631 is 1134. The population growth rate in 18631 is -29.76%. The population density of 18631 is 610.

A: The majority race/ethnicity of people residing in 18631 is White (97.41%).

A: The median household income in 18631 is $46,250 (2021) and the average adjusted income is $-1 ().