I forgot, what town is the center point of North America?

Answer 1

It's near Rugby, North Dakota.

Answer 2

From Wikipedia:
"The United States Geographical Survey states that the geographic center of North America is “6 miles west of Balta, Pierce County, North Dakota” at approximately 48° 10′North, 100° 10′West, approximately 15 miles (25 km) from Rugby, North Dakota. The USGS further states that “No marked or monumented point has been established by any government agency as the geographic center of either the 50 States, the conterminous United States, or the North American continent.” Nonetheless, there is a 15 foot (4.5 m) field stone obelisk in Rugby claiming to mark the center."