About 21220 - Middle River, Maryland
Located in Maryland, the United States is home to the densely populated community of Middle River, served by ZIP code 21220. It sits within Middle River County.
Around 40,964 people live in the 21220 ZIP code area. That's noticeably above the average for a Maryland ZIP code, which sits near 23,118 people.
Median household income is about $84,200 (below the Maryland average).
This ZIP code sits alongside neighboring areas like Essex, White Marsh, Frederick within Maryland.