| Capitol Grounds | |
| Location: | Washington, D.C. |
| Opened: | 1884 |
| Surface: | Grass |
| Tenants: | Washington Nationals (UA) |
| Capacity: | 6,000 |
The Capitol Grounds Capitol Park (I), was a baseball field in Washington, D.C. The grounds were the home field for the Washington Nationals of the Union Association during the league's only season in .[1] The ballpark had a seating capacity of 6,000, and was where the Russell Senate Office Building stands today.[2]
The ball field was bounded by C Street NE (north); Delaware Avenue NE (west): B Street (now Constitution Avenue) NE (south); and First Street NE (east); just northeast of the Capitol building.
After dropping out of the Union Association, the club joined the minor Eastern League for the 1885 season. The club regrouped as a new entry to the National League in 1886, and moved a few blocks north to the larger Capitol Park (II).