The main industries in Grímsnes are agriculture, services and tourism. A few inhabitants are employed by the hydroelectric power stations on the river Sog. A few hamlets have developed there and at Borg, where there is a school, a community centre and a shop. There is increased co-operation between the local district and Þingvellir district in the areas of education and social services. The three churches of the Grímsnes parish are at Mosfell, Stóra-Borg and Búrfell, and there is a chapel at Sólheimar, a centre for self-supporting mentally handicapped people.
Geothermal power is increasingly being exploited in the district for house heating, aquaculture, horticulture and other industry. Grímsnes has the greatest number of summer and holiday houses in all of Iceland and their number is growing. The best-known sights in the district are the crater Kerið, Seyðishólar, Þrastarskógur woodland and the power stations on the river Sog. Kerið and neighboring Kerhóll are nature reserves.