San Carlos Marketing Company
- Describes the community, with history, photos before and after development, recreational activities, and areas where lots are available. [English/Spanish]
- http://www.si-sancarlos.com

Bahia Delfin Condominios
- Development under construction provides floor plans, photos, and prices.
- http://bahiadelfin.com/

SC Quality Homes
- Builder gives company history, photos and complete work, and information on properties for sale. [English/Spanish]
- http://www.scqualityhomes.com

McGowan & Rodriguez
- Nuevo Guaymas. Real estate firm provides photos and descriptions on current listings, with information on financing.
- http://www.mrestates.com/

Surgery Center of San Carlos
- Cosmetic surgery by bilingual, certified physicians. Provides online consultation request form and information on accommodation packages available. [English/Spanish]
- http://www.cscsancarlos.com