Costa Mesa Municipal Code
- Provides access to the general and permanent ordinances and building codes in a searchable, easy to read format.
- http://www.municode.com/resources/gateway.asp?pid=10425&sid=5

The Costa Mesa Bark Park
- Dog park. Site includes information and directions, and volunteer opportunities.
- http://www.cmbarkpark.org/

Costa Mesa Chamber of Commerce
- Provides business listings, tourism and education information, city demographics, economic development, and elected representatives information.
- http://www.costamesachamber.com/

City of Costa Mesa
- Official directory of information about city services, local businesses, and community events.
- http://www.ci.costa-mesa.ca.us/