| County : | Washtenaw County |
| State : | Michigan (MI) |
| Land Area : | 705.96 sq mi |
| Water Area : | 16.45 sq mi |
| Latitude : | 42.2523272 |
| Longitude : | -83.8446336 |
| Population (2010): | 344,791 |
| Population Estimate (2012) : | 346,010 |
| Population Density : | 488.40/sq mi |
| Housing Units (2012) : | 147,573 |
| Median Household Income (2012) : | $59,063 (Michigan : $48,471, USA : $53,046) |
| Median Family Income (2012) : | $84,072 (Michigan : $60,749, USA : $64,585) |
| Median House Price (2012) : | $200,300 (Michigan : $128,600, USA : $181,400) |
Washtenaw County Cities / Towns
| Ann Arbor City (113,934) | Barton Hills Village (294) | Chelsea City (4,944) |
| Dexter Village (4,067) | Manchester Village (2,091) | Milan City (5,836) |
| Saline City (8,810) | Whitmore Lake (6,423) | Ypsilanti City (19,435) |
Washtenaw County Zip Codes
| 48103 (53,057) | 48104 (38,315) | 48105 (33,905) |
| 48108 (26,164) | 48109 (6,904) | 48111 (42,313) |
| 48118 (12,552) | 48130 (14,420) | 48137 (4,796) |
| 48158 (7,309) | 48160 (13,785) | 48167 (21,534) |
| 48168 (21,781) | 48169 (20,813) | 48170 (39,963) |
| 48176 (21,447) | 48178 (29,320) | 48189 (13,632) |
| 48190 (107) | 48191 (4,054) | 48197 (61,132) |
| 48198 (38,186) | 49236 (4,838) | 49240 (8,703) |
| 49285 (5,720) | 49287 (2,099) |