<page_title> List of counties in Maryland </page_title> <section_title> List of counties </section_title> <table> <cell> Anne Arundel County <col_header> County </col_header> <col_header> Allegany County </col_header> </cell> <cell> 1650 <col_header> Established </col_header> <row_header> Anne Arundel County </row_header> </cell> <cell> Formed from part of St. Mary's County. <col_header> Origin </col_header> <row_header> Anne Arundel County </row_header> </cell> </table>
In 1650, Anne Arundel County separated from St. Mary's County.