- Area: 2.34 square miles
- Incorporated: 1967
- Location: 23 miles west of the Town of Bernalillo at the junction of US 550 and NM 4
- Population, 2015: 195
San Ysidro is an agricultural community that also provides services to travelers on busy U.S. 550. San Ysidro is also a stopping point on scenic New Mexico State Road 4. Cattle ranching is still important to the area, and the state Transportation Department has a maintenance and construction yard in the village.
In 1699, Juan Trujillo and others were the first Europeans to settle here. The Spanish governor in 1786 granted Antonio Armenta and Salvador Sandoval the land where the community of San Ysidro grew. Named for the patron saint of farmers, San Ysidro was a crossing for major trails in early New Mexico, and the community still plays that role.
- Four trustees, elected for four-year staggered terms
- Mayor, elected
- Electric: Jemez Mountains Electric Cooperative
- Natural Gas: not available; liquid compressed gas is available
- Sewer: Individual on-site systems
- Solid Waste: Personal responsibility
- Source: Ground water
- Telephone: GTE West
- Water: Village of San Ysidro
- Highways: U.S. 550 and New Mexico State Road 4
- Transit: Rio Metro fixed route
- Kindergarten to 12th grade: Jemez Valley Public School District
- Cabezon Peak, between San Ysidro and Cuba, is a massive volcanic plug formed millions of years ago when Mt. Taylor (near Grants) was an active volcano. Rising 1,000', it's far larger than the better known Devil's Tower in Wyoming. It can be climbed without equipment.
- The San Ysidro Recreation Area is 3,000 acres of colorful rock at the southern tip of the Nacimiento Mountains. South of San Ysidro is the 11,000-acre Ojito Wilderness Area, created in 2006. The longest dinosaur ever discovered - called the "Seismosaurus" - was found in the Ojito Wilderness.
- In the Jemez Mountains, overlooking Jemez Springs, are numerous trails, hot springs and a water fall.
- Just outside the village is the one-mile Perea Nature Trail; in the distance, rock formations with purple hues are part of the Nacimiento Mountain chain. Nearby White Mesa, composed of gypsum, is also the setting for trails used for hiking, biking and horseback riding.
- State Monuments: Coronado State Monument, which skirts the nearby Town of Bernalillo, preserves the ruins of the Pueblo of Kuaua. Visitors can take advantage of a museum, a self-guided trail, and gallery showcasing kiva paintings. North of Jemez Springs is Jemez State Monument, the prehistoric site of the Pueblo of Giusewa and ruins of the mission Church of San José de los Jemez.