During the Spanish civil war it became the site of major battles, a reminder of this time are the concrete forms of bunkers that remain in the Dehesa of Navalcarbón and along the valley of the river Guadarrama.

In the winter of 1936 the pro-Franco troops advanced for the west of Madrid from their bases at Brunete, Villaviciosa de Odón and Campamento.

The inhabitants of Las Rozas took refuge in other places of the nearby Sierra (mountains) such as the caves in Hoyo de Manzanares.

There is a project proposal to encourage ecologically sustainable transport, especially of electrical scooters, entitled Las Rozas: la Capital Verde del Noroeste de Madrid which suggests either El Pinar or Las Matas should have a park and Ride facility providing access to major retailers in the municipality as well as commuter links to Madrid city.

For the filming of 55 Days at Peking many locals (called "roceños") were employed as extras and as the bricklayers that built the sets decorated them in tribute to the beauty of Ava Gardner.

There are also various themed street-markets, fairs celebrating horsemanship in April, various seafood and tapas exhibitions in the summer and Festibike international cycling event in the autumn.

Las Rozas has also a Basketball team which competes in Spanish third level called "LIGA LEB Plata".

Also playing at the el Cantizal field are the Las Rozas Black Demons, an American Football team competing in the LNFA.

Another noticeable facility in the municipality is the Ciudad del fútbol de la Real Federación Española de Fútbol (Royal Spanish Football Federation's Football City), build on lands donated by the Town Council.

Other popular sports are the Toad in the hole, Hammer throw, Calva, a sort of Horseshoes and chito, a pastime in which a diskus is aimed at a target upon which a coin is balanced.

The current distribution of the councillors, after the municipal elections held in May 2023, is as follows:[3] Political parties in the Town Hall of Las Rozas 2023Since 2015, the mayor of Las Rozas is José de la Uz Pardos of the PP and currently rules in absolute majority with 18 councillors.