CIA - The World Factbook: San Marino - https://www.cia.gov/library/publications/the-world-factbook/geos/sm.html Features map and brief descriptions of the geography, people, government, economy, communications, transportation, military and transnational issues.
US Department of State - San Marino - http://www.state.gov/p/eur/ci/sm/ Country portal offers a map and links to Background Notes, the US embassy and the current ambassador, press releases, fact sheets, annual Human Rights Reports and other major reports including Industry Market Reports.
Windows on Italy: San Marino - http://www.italyguide.com/INFO/country/smarino.html General country information including population and economic resources.
BBC News - Country Profile: San Marino - http://news.bbc.co.uk/1/hi/world/europe/country_profiles/2669927.stm Provides overview, key facts and events, timelines and leader profiles along with current news.
San Marino Site - http://www.sanmarinosite.com/ Offers information on tourism, business, shopping, and attractions. Some sections in English.
Republic of San Marino - http://www.sanmarinonline.com/ History, economy, cartography, museum, government of Republic of San Marino.
Wikipedia - San Marino - http://en.wikipedia.org/wiki/San_Marino Hyperlinked encyclopedia article covers the country's history, government and politics, geography, economy, demographics, language and culture.