Norway had 435 municipalities of varying size in 2003, each administered by an elected municipal council. They are grouped into 19 counties ( fylker ), each governed by an elected county council. Each county is headed by a governor appointed by the king in council. Oslo is the only urban center that alone constitutes a county; the remaining 18 counties consist of both urban and rural areas. County and municipal councils are popularly elected every four years. The municipalities have wide powers over the local economy, with the state exercising strict supervision. They have the right to tax and to use their resources to support education, libraries, social security, and public works such as streetcar lines, gas and electricity works, roads, and town planning, but they are usually aided in these activities by state funds.