<Table> <Tr> <Th_colspan="2"> Fairfax County, Virginia </Th> </Tr> <Tr> <Td_colspan="2"> County </Td> </Tr> <Tr> <Td_colspan="2"> County of Fairfax </Td> </Tr> <Tr> <Td_colspan="2"> The Fairfax County Courthouse at Fairfax in 2010 . </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> Flag </Td> <Td> Seal </Td> </Tr> <Tr> <Td_colspan="2"> Logo </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> Nickname (s): "Fairfax" </Td> </Tr> <Tr> <Td_colspan="2"> Location in the U.S. state of Virginia </Td> </Tr> <Tr> <Td_colspan="2"> Virginia's location in the U.S. </Td> </Tr> <Tr> <Th> Founded </Th> <Td> June 19, 1742 </Td> </Tr> <Tr> <Th> Named for </Th> <Td> Thomas Fairfax, 6th Lord Fairfax of Cameron </Td> </Tr> <Tr> <Th> Seat </Th> <Td> Fairfax </Td> </Tr> <Tr> <Th> Largest town </Th> <Td> Herndon </Td> </Tr> <Tr> <Th> Area </Th> <Td> </Td> </Tr> <Tr> <Th> Total </Th> <Td> 406 sq mi (1,052 km) </Td> </Tr> <Tr> <Th> Land </Th> <Td> 391 sq mi (1,013 km) </Td> </Tr> <Tr> <Th> Water </Th> <Td> 15 sq mi (39 km), 3.8% </Td> </Tr> <Tr> <Th> Population (est .) </Th> <Td> </Td> </Tr> <Tr> <Th> (2017) </Th> <Td> 1,148,433 </Td> </Tr> <Tr> <Th> Density </Th> <Td> 2,937 / sq mi (1,134 / km) </Td> </Tr> <Tr> <Th> Congressional districts </Th> <Td> 8th, 10th, 11th </Td> </Tr> <Tr> <Th> Time zone </Th> <Td> Eastern: UTC − 5 / − 4 </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.fairfaxcounty.gov </Td> </Tr> <Tr> <Td_colspan="2"> Footnotes: Administrative and court offices are located in unincorporated areas in Fairfax County </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Fairfax County, Virginia </Th> </Tr>

How many districts are there in fairfax county
find me the text answering this question