About Los Alamos

Photograph of Los Alamos downtown.  Tree lined street with mountains in the background.

Welcome to the Los Alamos County government website - a gateway to information and services within and around Los Alamos County. Whether you are a citizen, business, or visitor, we designed this site to help you quickly and easily locate information and engage with us. Still looking for what you need? Email us at lacmanager@lacnm.us.

About the community

Comprising a little more than 19,000 residents, we are two small communities in one County - Los Alamos townsite and White Rock. We are also home to one of the National Nuclear Security Administration's laboratories - Los Alamos National Laboratory.

Community life

Community life features small-town living with friendly neighbors, low crime, and a nationally ranked public school district. It is also a community that seamlessly blends impressive culture and history with spectacular outdoor beauty and adventure. Residents and visitors alike can explore the 200+ miles of developed hiking and biking trails, enjoy summer and winter recreation at the local Pajarito Mountain ski area, and play high-altitude sports at the local Golf Course, the outdoor NHL regulation Ice Rink and the Olympic-sized Aquatic Center.

Gateway to three national parks

Did we mention that we are Gateway to Three National Parks, with the Manhattan Project National Historical Park located in downtown Los Alamos, Bandelier National Monument bordering the Los Alamos National Laboratory on the south side of the County, and the Valles Caldera National Preserve up the road in the Jemez Mountains on the west side of the County? Learn more about all the local assets and attractions at visitlosalamos.org.

Climate/Geographical Information

We are located on the Pajarito Plateau in the mountains of Northern New Mexico. It is approximately 90 miles north of Albuquerque, 35 miles from Santa Fe, and 55 miles from Taos.


At 7,355 feet altitude, Los Alamos is "big pine" country with a mild, four-season climate. Summers have moderately warm days and cool nights. Afternoon temperatures are in the 70s and 80s and infrequently reach 90 degrees. The relatively thin air, light winds, clear skies and dry atmosphere cause nighttime temperatures to drop to the 50s even after the warmest day. Winter storms are typically short in duration, with many mild, sunny days. The annual average high temperature is 70 degrees, and the average low is 42. We are surrounded by National Forest, National Parks, Pueblos, and other Federal lands. It is the smallest county in New Mexico at 109 square miles.