Brook Park is located at 41°23′58″N 81°49′6″W (41.399550, −81.818423).
According to the United States Census Bureau, the city has a total area of 7.53 square miles (19.50 km2), all land.
While Brook Park's official name has always been spelled as two words, it is sometimes mistakenly seen spelled as one word, which is the spelling of nearby Brookpark Road.
Brook Park became a city in 1960. The city attracted national attention when 21 Marines of the 3rd battalion, 25th Marines Regiment, 4th Marine division headquartered in the city were killed in combat in Iraq on August 1 and August 3, 2005. The unit lost 48 Marines during the course of the deployment. On August 5, the city government printed and distributed American flags for every household in the city to display on their windows. On August 8, thousands of citizens from throughout Northeast Ohio attended a memorial service to show their support for the fallen Marines. National, state and local politicians also voiced their mutual support for the families affected and for the ongoing support needed for all of the service members still involved in their mission overseas.