| MIDDLESEX Resident total population estimate (July 1) 2009 | 790738 |
| MIDDLESEX Resident total population estimates base (April 1) 2000 | 750167 |
| MIDDLESEX Resident total population estimate percent change - April 1 2000 to July 1 2009 | 5.4 |
| MIDDLESEX Resident total population estimate net change - April 1 2000 to July 1 2009 | 40571 |
| MIDDLESEX Resident population (April 1) 2000 (complete count) | 750162 |
| MIDDLESEX Resident population under 5 years (July 1 - estimate) 2008 | 51870 |
| MIDDLESEX Resident population under 5 years percent (July 1 - estimate) 2008 | 6.6 |
| MIDDLESEX Resident population under 18 years (July 1 - estimate) 2008 | 182324 |
| MIDDLESEX Resident population under 18 years percent (July 1 - estimate) 2008 | 23.1 |
| MIDDLESEX Resident population 65 years and over percent (July 1 - estimate) 2008 | 12.2 |
| MIDDLESEX Resident population 65 years and over (July 1 - estimate) 2008 | 96163 |
| MIDDLESEX Resident population: total females percent (July 1 - estimate) 2008 | 50.5 |
| MIDDLESEX Resident population: White alone (July 1 - estimate) 2008 | 536842 |
| MIDDLESEX Resident population: Black alone (July 1 - estimate) 2008 | 85751 |
| MIDDLESEX Resident population: American Indian and Alaska Native alone (July 1 - estimate) 2008 | 2859 |
| MIDDLESEX Resident population: Asian alone (July 1 - estimate) 2008 | 151161 |
| MIDDLESEX Resident population: Native Hawaiian and Other Pacific Islander alone (July 1 - estimate) 2008 | 718 |
| MIDDLESEX Resident population: Two or more races (July 1 - estimate) 2008 | 11771 |
| MIDDLESEX Resident population: Hispanic or Latino Origin (July 1 - estimate) 2008 | 139184 |
| MIDDLESEX Resident population: Not Hispanic White alone (July 1 - estimate) 2008 | 415328 |
| MIDDLESEX Resident population: White alone percent (July 1 - estimate) 2008 | 68 |
| MIDDLESEX Resident population: Black alone percent (July 1 - estimate) 2008 | 10.9 |
| MIDDLESEX Resident population: American Indian and Alaska Native alone percent (July 1 - estimate) 2008 | 0.4 |
| MIDDLESEX Resident population: Asian alone percent (July 1 - estimate) 2008 | 19.2 |
| MIDDLESEX Resident population: Native Hawaiian and Other Pacific Islander alone percent (July 1 - estimate) 2008 | 0.1 |
| MIDDLESEX Resident population: Two or more races percent (July 1 - estimate) 2008 | 1.5 |
| MIDDLESEX Resident population: Hispanic or Latino Origin percent (July 1 - estimate) 2008 | 17.6 |
| MIDDLESEX Resident population: Not Hispanic White alone percent (July 1 - estimate) 2008 | 52.6 |
| MIDDLESEX Births 2006 | 10712 |
| MIDDLESEX Deaths 2006 | 5475 |
| MIDDLESEX Infant deaths under one year 2006 | 55 |
| MIDDLESEX Population 5 years and over by residence in 1995 - percent in same house 2000 (sample) | 57.5 |
| MIDDLESEX Percent foreign born population 2000 (sample) | 24.2 |
| MIDDLESEX Population 5 years and over percent speaking language other than English at home 2000 (sample) | 33.4 |
| MIDDLESEX Educational attainment - persons 25 years and over - percent high school graduate or higher 2000 | 84.4 |
| MIDDLESEX Educational attainment - persons 25 years and over - percent bachelors degree or higher 2000 | 33 |
| MIDDLESEX Civilian noninstitutionalized population 5 years and over with a disability 2000 (sample) | 112382 |
| MIDDLESEX Average travel time to work for workers 16 years and over not working at home 2000 | 31.5 |
| MIDDLESEX Housing unit estimates as of July 1 2008 | 288590 |
| MIDDLESEX Housing unit estimates - net change April 1 2000 (base) to July 1 2008 | 14949 |
| MIDDLESEX Housing unit estimates - percent change April 1 2000 (base) to July 1 2008 | 5.5 |
| MIDDLESEX Owner-occupied housing units - percent of total occupied housing units 2000 (complete count) | 66.7 |
| MIDDLESEX Median value of specified owner-occupied housing units 2000 (sample) | 168500 |
| MIDDLESEX Housing units by units in structure - multiple units 2000 (sample) | 34.4 |
| MIDDLESEX Households 2000 (complete count) | 265815 |
| MIDDLESEX Persons per household 2000 (complete count) | 2.74 |
| MIDDLESEX Per capita income in 1999 | 26535 |
| MIDDLESEX Median household income 2008 | 77015 |
| MIDDLESEX People of all ages in poverty - percent 2008 | 7.1 |
| MIDDLESEX Personal income 2007 | 36547 |
| MIDDLESEX Per capita personal income 2007 | 46674 |
| MIDDLESEX Civilian labor force 2008 | 425030 |
| MIDDLESEX Civilian labor force unemployment 2008 | 21357 |
| MIDDLESEX Civilian labor force unemployment rate 2008 | 5 |
| MIDDLESEX Employment in all industries (NAICS no code) 2007 | 515757 |
| MIDDLESEX Employment in all industries net change 2000 - 2007 | 32865 |
| MIDDLESEX Employment in government (NAICS 92) 2007 | 61555 |
| MIDDLESEX Earnings in all industries (NAICS no code) 2007 | 3.24e+07 |
| MIDDLESEX Earnings in all industries (NAICS no code) average earnings per job 2007 | 62820 |
| MIDDLESEX Private nonfarm establishments 2007 | 22149 |
| MIDDLESEX Private nonfarm employment for pay period including March 12 2007 | 394156 |
| MIDDLESEX Private nonfarm employment for pay period including March 12 2006 percent change 2000-2007 | 1 |
| MIDDLESEX Nonemployer: total (NAICS 00) - establishments 2007 | 48799 |
| MIDDLESEX Accommodation and Food Services: total (NAICS 72) - sales of establishments with payroll 2002 | 974839 |
| MIDDLESEX Total number of firms 2002 | 58486 |
| MIDDLESEX Total Black-owned firms percent 2002 | 5.1 |
| MIDDLESEX Total American Indian-and Alaska Native-owned firms percent 2002 | 0.5 |
| MIDDLESEX Total Asian-owned firms percent 2002 | 16.2 |
| MIDDLESEX Total Hispanic-owned firms percent 2002 | 6.8 |
| MIDDLESEX Total Native Hawaiian-and Other Pacific Islander-owned firms percent 2002 | 0 |
| MIDDLESEX Total women-owned firms percent 2002 | 22.7 |
| MIDDLESEX Manufacturing: total (NAICS 31-33) - value of shipments 2002 | 1.15702e+07 |
| MIDDLESEX Wholesale trade: total (NAICS 42) - sales of establishments with payroll 2002 | 2.95177e+07 |
| MIDDLESEX Retail trade: total (NAICS 44-45) - sales of establishments with payroll 2002 | 8.89341e+06 |
| MIDDLESEX Retail trade: total (NAICS 44-45) - sales of establishments with payroll per capita 2002 | 11549 |
| MIDDLESEX New private housing units authorized by building permits - total 2008 (20000-place universe) | 1020 |
| MIDDLESEX Valuation of new private housing units authorized by building permits 2008 (20000-place universe) | 134335 |
| MIDDLESEX Land in farms (NAICS) 2007 (acres) (adjusted) | 18717 |
| MIDDLESEX Federal Government expenditure - total FY 2008 | 4.82098e+06 |
| MIDDLESEX Federal Government expenditure per capita FY 2008 | 6109 |
| MIDDLESEX Land area in square miles 2000 | 309.72 |
| MIDDLESEX Population per square mile 2000 | 2420 |
