Weldon Spring city is located in the County of St. Charles. Weldon Spring has a total area of about 22 sq. kms. and it is elevated from the sea level by about 22 sq. kms. and elevated from the sea level by about 540 ft. The local economy mainly consisted of various private business ventures. Some of the prominent business ventures are hair removal and replacement product sales and a few law firms. There are also quite a few retail shops and automobile maintenance and servicing centers.