Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Courthouse | City | Street address | Jurisdiction | Dates of use | Named for |
| --- | --- | --- | --- | --- | --- |
| U.S. Post Office and Court House† | Aberdeen | 201 W. Commerce St. | N.D. Miss. | 1888–1974\nNow the Monroe County Chancery Court. | n/a |
| Thomas G. Abernethy Federal Building | Aberdeen | 301 West Commerce Street | N.D. Miss. | ?-present | U.S. Rep. Thomas Abernethy |
| U.S. Post Office, Court House, & Custom House | Biloxi | 140 Lameuse Street | S.D. Miss. | 1908-1959\nNow Biloxi City Hall. | n/a |
| U.S. Post Office & Court House | Biloxi | ? | S.D. Miss. | 1908-1959\nFate of building unknown. | n/a |
| U.S. Post Office | Clarksdale | ? | N.D. Miss. | 1916-1964\nRazed in 1968. | n/a |
| Federal Building | Clarksdale | ? | N.D. Miss. | 1964-1997\nFate of building unknown. | n/a |
| Federal Building | Greenville | 305 Main Street | N.D. Miss. | 1960-present | n/a |
| Dan M. Russell Jr. Federal Bldg & U.S. Courthouse | Gulfport | 2012 15th Street | S.D. Miss. | 2003-present | District Court judge Dan Monroe Russell, Jr. |
| U.S. Court House | Hattiesburg | ? | S.D. Miss. | 1936-?\nCompleted in 1911; now the Forrest County Courthouse Building. | n/a |
| William M. Colmer Federal Bldg & U.S. Courthouse | Hattiesburg | 701 Main Street | S.D. Miss. | ?-present | U.S. Rep. William M. Colmer |
| U.S. Court House & Post Office | Jackson | ? | S.D. Miss. | 1885-1933 | n/a |
| James Eastland Federal Building | Jackson | ? | S.D. Miss.\n5th Cir. | 1934-present\n1981-present | U.S. Sen. James Eastland (1984) |
| U.S. Post Office & Courthouse | Meridian | 8th St and 22nd Ave | S.D. Miss. | 1898-1933\nRazed in the 1950s. | n/a |
| U.S. Post Office & Courthouse† | Meridian | 2100 9th Street | S.D. Miss. | 1933-present | n/a |
| U.S. Courthouse | Natchez | 109 Pearl Street | S.D. Miss. | 2007-present\nBuilt in 1853 | n/a |
| U.S. Court House & Post Office | Oxford | 107 Courthouse Square | N.D. Miss. | 1887-ca. 1974\nNow Oxford City Hall. | n/a |
| Federal Bldg, Post Office, & Courthouse | Oxford | 911 Jackson Avenue | N.D. Miss. | ?-present | n/a |
| U.S. Court House, Post Office & Custom House | Vicksburg | 1400 Walnut Street | S.D. Miss. | 1892-1937\nNow in use by the Mississippi River Commission. | n/a |
| U.S. Post Office & Court House | Vicksburg | ? | S.D. Miss. | 1937-present\nNow privately owned. | n/a |
Question:
how many courthouses were named for someone?
Answer:
4