Editing Mount Joy, Pennsylvania (section)

==Geography==
Mount Joy is located in northwestern Lancaster County at {{Coord|40|6|36|N|76|30|40|W|type:city}} (40.109895, -76.510977).<ref name="GR1">{{cite web|url=https://www.census.gov/geographies/reference-files/time-series/geo/gazetteer-files.html|publisher=[[United States Census Bureau]]|access-date=2011-04-23|date=2011-02-12|title=US Gazetteer files: 2010, 2000, and 1990}}</ref> [[Pennsylvania Route 230]] passes through the center of town as Main Street, leading southeast {{convert|12|mi}} to [[Lancaster, Pennsylvania|Lancaster]], the [[county seat]], and northwest {{convert|6|mi|0}} to [[Elizabethtown, Pennsylvania|Elizabethtown]]. [[Harrisburg, Pennsylvania|Harrisburg]], the state capital, is {{convert|25|mi}} to the northwest via PA-230. [[Pennsylvania Route 772|PA-772]] crosses PA-230 west of the borough center and leads northeast {{convert|7|mi|0}} to [[Manheim, Pennsylvania|Manheim]] and southwest {{convert|5|mi|0}} to [[Marietta, Pennsylvania|Marietta]] on the [[Susquehanna River]].

According to the [[United States Census Bureau]], the borough has a total area of {{convert|6.3|sqkm|order=flip}}, of which {{convert|0.04|sqkm|order=flip|2}}, or 0.64%, are water.<ref name="CenPopGazetteer2019">{{cite web|title=2019 U.S. Gazetteer Files|url=https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2019_Gazetteer/2019_gaz_place_42.txt|publisher=United States Census Bureau|access-date=July 28, 2020}}</ref> [[Little Chiques Creek]], a south-flowing tributary of [[Chiques Creek]] and part of the Susquehanna River watershed, crosses the eastern side of the borough.

In the 1970s, Mount Joy was chosen as the site of one of ten [[WGU-20|Decision Information Distribution System]] radio stations, designed to alert the public of an enemy attack. The system was never implemented and the station was not built.