Marion County, Missouri Cities (2024)

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

City
Rank
2024 Pop.
2020 Pop.
Change
Density (/mi²)
Area (mi²)
Type
Hannibal116,76117,069-0.46%1,04716.0City
Palmyra23,5943,618-0.17%1,1583.1City
Philadelphia33521867.65%4650.8CDP
Rensselaer42522500%1292.0Village
Sundown51861068.14%1271.5CDP

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Marion County, Missouri?

Hannibal is the largest city in Marion County.

What is the smallest city in Marion County, Missouri?

Sundown is the smallest city in Marion County.

How many cities are in Marion County?

There are 5 cities in Marion County, Missouri.

Frequently Asked Questions