ZIP code 52568 is officially located in the state of Iowa, primarily serving the city of Martinsburg. It falls under the administrative jurisdiction of Keokuk County. When planning mail delivery, logistics routing, or demographic research, 52568 operates within the Central Time (CT) timezone and supports the 228 area codes.
According to the latest US Census Bureau and American Community Survey (ACS) datasets, the total population residing within the 52568 ZIP Code Tabulation Area is approximately 42,228. Understanding local economics is critical for market analysis; the median household income in this postal area sits at $96,568.