Clarence Telephone Company
- Provides telephone, wireless, Internet, cable and satellite TV services. Includes rates and newsletter.
- http://www.clarencetelinc.com/

Clarence Lincoln Highway Festival
- Held annually in late June. Includes schedule of events, volunteer information, photographs and park map.
- http://www.lincolnhighwayfestival.com/

River Valley Cooperative
- Exists to supply farmers’ feed, agronomy, and energy needs while offering a viable grain market. Includes information about products and services, quotes, newsletter, photographs and events.
- http://www.clarencecooperative.com/

City-Data.com: Clarence, Iowa
- Profiles housing, population demographics, jobs, weather and climate tables. Contains a list of area hospitals, schools, airports, radio and TV broadcast stations, photographs and maps.
- http://www.city-data.com/city/Clarence-Iowa.html

Galloping Winds Web Design
- Offering website hosting, design and maintenance, and equine photography. Includes portfolio and rates.
- http://www.gallopingwinds.com/

St. John's United Church of Christ
- Features mission, worship schedule, ministries, a blog and links.
- http://www.sjuccclarence.org/

Clarence, Iowa
- Official website provides an overview of the community and covers local government, economic development, culture and recreation, history, facts and figures, and FAQs. Includes photographs.
- http://showcase.netins.net/web/clarencecityhall/

Wikipedia - Clarence, Iowa
- Encyclopedia article features history, geography and demographics.
- http://en.wikipedia.org/wiki/Clarence,_Iowa