snapshot: school district class size, 2011-12
By Matt Carroll, Globe Staff | Nov. 15, 2012
Class size in public school districts varies widely across the state, with smaller districts, including charter schools, tending to have smaller sizes. The graphic shows the top 25 districts, with a minimum of 100 students. The chart shows all districts. The 2011-2012 data is from the Department of Elementary and Secondary Education.
| School district | Class size, 2011-2012 | Rank |
| Abby Kelley Foster Charter | 20 | 277 |
| Abington | 24.3 | 364 |
| Academy of Strategic Learning Charter | 10.3 | 4 |
| Academy of the Pacific Rim Charter | 23.9 | 361 |
| Acton | 22.5 | 350 |
| Acton-Boxborough | 21.5 | 334 |
| Acushnet | 23.2 | 357 |
| Adams-Cheshire | 16.2 | 76 |
| Agawam | 19.2 | 212 |
| Amesbury | 19.7 | 249 |
| Amherst | 19.8 | 255 |
| Amherst-Pelham | 14.4 | 31 |
| Andover | 20.9 | 316 |
| Arlington | 18.5 | 182 |
| Ashburnham-Westminster | 19.3 | 222 |
| Ashland | 19.6 | 246 |
| Assabet Valley Vocational | 15.4 | 59 |
| Athol-Royalston | 17.6 | 136 |
| Atlantis Charter | 21.2 | 325 |
| Attleboro | 20.4 | 293 |
| Auburn | 19.3 | 222 |
| Avon | 16.2 | 76 |
| Barnstable | 17.2 | 121 |
| Barnstable Charter | 21.4 | 331 |
| Bedford | 15.5 | 62 |
| Belchertown | 18.4 | 179 |
| Bellingham | 19.6 | 246 |
| Belmont | 21.3 | 327 |
| Benjamin Banneker Charter | 19.5 | 238 |
| Benjamin Franklin Charter | 25 | 366 |
| Berkley | 18.1 | 160 |
| Berkshire Arts & Technology Charter | 18.1 | 160 |
| Berkshire Hills | 17 | 109 |
| Berlin | 14 | 28 |
| Berlin-Boylston | 16.3 | 81 |
| Beverly | 21 | 319 |
| Billerica | 20 | 277 |
| Blackstone-Millville | 19.8 | 255 |
| Blackstone Valley Vocational | 17.1 | 113 |
| Blue Hills Vocational | 18 | 153 |
| Boston | 17.7 | 142 |
| Boston Collegiate Charter | 19.8 | 255 |
| Boston Evening Academy | 13.2 | 16 |
| Boston Preparatory Charter | 24.2 | 363 |
| Boston Renaissance Charter | 21.5 | 334 |
| Bourne | 18.1 | 160 |
| Boxborough | 19.7 | 249 |
| Boxford | 16.3 | 81 |
| Boylston | 17.4 | 129 |
| Braintree | 18.5 | 182 |
| Brewster | 18.9 | 201 |
| Bridgewater-Raynham | 22.7 | 352 |
| Brimfield | 15.1 | 52 |
| Bristol-Plymouth Vocational | 17.8 | 147 |
| Bristol County Agricultural | 18.6 | 187 |
| Brockton | 19.9 | 266 |
| Brookfield | 18.2 | 167 |
| Brookline | 17.7 | 142 |
| Burlington | 18.8 | 198 |
| Cambridge | 15.9 | 70 |
| Canton | 19.9 | 266 |
| Cape Cod Lighthouse Charter | 37.5 | 375 |
| Cape Cod Vocational | 14 | 28 |
| Carlisle | 19.8 | 255 |
| Carver | 19.7 | 249 |
| Central Berkshire | 16.8 | 100 |
| Chatham | 14.4 | 31 |
| Chelmsford | 19.9 | 266 |
| Chelsea | 21.2 | 325 |
| Chesterfield-Goshen | 19.4 | 233 |
| Chicopee | 18.2 | 167 |
| Christa McAuliffe Regional Charter | 17 | 109 |
| City On A Hill Charter | 15 | 48 |
| Clarksburg | 20.4 | 293 |
| Clinton | 18.2 | 167 |
| Codman Academy Charter | 16.2 | 76 |
| Cohasset | 20.6 | 304 |
| Community Day Charter | 20.8 | 311 |
| Concord | 17.1 | 113 |
| Concord-Carlisle | 19.5 | 238 |
| Conservatory Lab Charter | 19 | 205 |
| Conway | 17.6 | 136 |
| Danvers | 19.3 | 222 |
| Dartmouth | 20.5 | 298 |
| Dedham | 16.8 | 100 |
| Deerfield | 19.4 | 233 |
| Dennis-Yarmouth | 16.6 | 92 |
| Dighton-Rehoboth | 19.2 | 212 |
| Douglas | 20.9 | 316 |
| Dover | 18.3 | 174 |
| Dover-Sherborn | 15.2 | 55 |
| Dracut | 21.8 | 340 |
| Dudley-Charlton | 19.9 | 266 |
| Duxbury | 20.7 | 309 |
| East Bridgewater | 28.2 | 374 |
| Eastham | 17.6 | 136 |
| Easthampton | 19 | 205 |
| East Longmeadow | 20.2 | 285 |
| Easton | 19.8 | 255 |
| Edgartown | 17.2 | 121 |
| Edward Brooke Charter | 18.4 | 179 |
| Erving | 18 | 153 |
| Essex Agricultural | 17.1 | 113 |
| Everett | 19.8 | 255 |
| Excel Academy Charter School | 26.3 | 369 |
| Fairhaven | 17.1 | 113 |
| Fall River | 20.2 | 285 |
| Falmouth | 16.4 | 86 |
| Farmington River | 17.1 | 113 |
| Fitchburg | 20.8 | 311 |
| Florida | 12.5 | 9 |
| Four Rivers Charter School | 14.3 | 30 |
| Foxborough | 17.2 | 121 |
| Foxborough Regional Charter | 23.7 | 360 |
| Framingham | 18.6 | 187 |
| Francis W Parker Charter | 11.3 | 5 |
| Franklin | 21.3 | 327 |
| Franklin County Vocational | 11.8 | 6 |
| Freetown-Lakeville | 22 | 343 |
| Frontier | 12.8 | 12 |
| Gardner | 19.2 | 212 |
| Gateway | 16.9 | 106 |
| Georgetown | 22.8 | 354 |
| Gill-Montague | 14.7 | 39 |
| Gloucester | 17.7 | 142 |
| Grafton | 19.4 | 233 |
| Granby | 15.6 | 64 |
| Granville | 17.4 | 129 |
| Greater Fall River Vocational | 14.6 | 37 |
| Greater Lawrence Vocational | 16 | 73 |
| Greater Lowell Vocational | 15.1 | 52 |
| Greater New Bedford Vocational | 15.3 | 56 |
| Greenfield | 20.4 | 293 |
| Groton-Dunstable | 18.9 | 201 |
| Hadley | 16.8 | 100 |
| Halifax | 19.2 | 212 |
| Hamilton-Wenham | 19.1 | 210 |
| Hampden-Wilbraham | 20.9 | 316 |
| Hampshire | 14.8 | 45 |
| Hanover | 21.3 | 327 |
| Harvard | 19 | 205 |
| Harwich | 15 | 48 |
| Hatfield | 14.5 | 35 |
| Haverhill | 18.5 | 182 |
| Hawlemont | 13.5 | 21 |
| Health Careers Academy Charter | 17.5 | 133 |
| Hilltown Cooperative Charter | 22 | 343 |
| Hill View Montessori Charter | 21.3 | 327 |
| Hingham | 19.9 | 266 |
| Holbrook | 19.4 | 233 |
| Holland | 17.6 | 136 |
| Holliston | 16.6 | 92 |
| Holyoke | 17.1 | 113 |
| Hopedale | 18 | 153 |
| Hopkinton | 19.9 | 266 |
| Hudson | 17.7 | 142 |
| Hull | 19.3 | 222 |
| Ipswich | 19.8 | 255 |
| King Philip | 20.5 | 298 |
| Kingston | 22.9 | 355 |
| Kipp Academy Lynn Charter | 23.9 | 361 |
| Lanesborough | 16.9 | 106 |
| Lawrence | 20.6 | 304 |
| Lawrence Family Development Charter | 17.9 | 150 |
| Lee | 14.5 | 35 |
| Leicester | 21.5 | 334 |
| Lenox | 13.6 | 23 |
| Leominster | 18.5 | 182 |
| Leverett | 16.7 | 97 |
| Lexington | 19.3 | 222 |
| Lincoln | 16.2 | 76 |
| Lincoln-Sudbury | 20.5 | 298 |
| Littleton | 20 | 277 |
| Longmeadow | 19.9 | 266 |
| Lowell | 19.2 | 212 |
| Lowell Community Charter | 54.8 | 376 |
| Lowell Middlesex Academy Charter | 13.4 | 19 |
| Ludlow | 17.6 | 136 |
| Lunenburg | 20.8 | 311 |
| Lynn | 19.5 | 238 |
| Lynnfield | 21 | 319 |
| Malden | 21.1 | 324 |
| Manchester Essex | 20.3 | 289 |
| Mansfield | 20.5 | 298 |
| Marblehead | 18.7 | 193 |
| Marblehead Community Charter | 21.4 | 331 |
| Marion | 19.9 | 266 |
| Marlborough | 18 | 153 |
| Marshfield | 23.4 | 358 |
| Marston Mill East Horace Mann Charter | 19.7 | 249 |
| Martha's Vineyard | 12.8 | 12 |
| Martha's Vineyard Public Charter | 16.5 | 90 |
| Masconomet | 17.9 | 150 |
| Mashpee | 15.4 | 59 |
| Mass. Academy for Math & Science | 15.3 | 56 |
| Mattapoisett | 16.7 | 97 |
| Maynard | 16.8 | 100 |
| Medfield | 19.6 | 246 |
| Medford | 16.3 | 81 |
| Media and Technology Charter | 22 | 343 |
| Medway | 18.3 | 174 |
| Melrose | 22.7 | 352 |
| Mendon-Upton | 20.6 | 304 |
| Methuen | 23.5 | 359 |
| Middleborough | 27.2 | 371 |
| Middleton | 16.3 | 81 |
| Milford | 19 | 205 |
| Millbury | 18.6 | 187 |
| Millis | 19.2 | 212 |
| Milton | 18.6 | 187 |
| Minuteman Vocational | 15.3 | 56 |
| Mohawk Trail | 13.5 | 21 |
| Monson | 20.8 | 311 |
| Montachusett Vocational | 19.7 | 249 |
| Mount Greylock | 15.1 | 52 |
| Murdoch Middle Public Charter | 20 | 277 |
| Mystic Valley Regional Charter | 26.2 | 368 |
| Nahant | 27.2 | 371 |
| Nantucket | 17 | 109 |
| Narragansett | 18.2 | 167 |
| Nashoba | 19.5 | 238 |
| Nashoba Valley Vocational | 14.7 | 39 |
| Natick | 20 | 277 |
| Nauset | 16.1 | 74 |
| Needham | 19.3 | 222 |
| Neighborhood House Charter | 22 | 343 |
| New Bedford | 18.3 | 174 |
| Newburyport | 20.2 | 285 |
| New Leadership Academy Charter | 14.7 | 39 |
| New Salem-Wendell | 17 | 109 |
| Newton | 19.3 | 222 |
| Norfolk | 21.6 | 338 |
| Norfolk County Agricultural | 18.3 | 174 |
| North Adams | 14.7 | 39 |
| Northampton | 17.3 | 125 |
| Northampton-Smith Vocational | 12.2 | 7 |
| North Andover | 22 | 343 |
| North Attleborough | 19.3 | 222 |
| Northborough | 18.1 | 160 |
| Northborough-Southborough | 17.7 | 142 |
| Northbridge | 19.5 | 238 |
| North Brookfield | 16.4 | 86 |
| North Central Charter | 13 | 15 |
| Northeast Metro Vocational | 19.9 | 266 |
| Northern Berkshire Vocational | 14.4 | 31 |
| North Middlesex | 21.8 | 340 |
| North Reading | 21.6 | 338 |
| North Shore Vocational | 13.8 | 26 |
| Norton | 20.6 | 304 |
| Norwell | 20.8 | 311 |
| Norwood | 18.1 | 160 |
| Oak Bluffs | 13.8 | 26 |
| Old Colony Vocational | 14.7 | 39 |
| Old Rochester | 18.6 | 187 |
| Orange | 17.6 | 136 |
| Orleans | 15.8 | 66 |
| Oxford | 18.2 | 167 |
| Palmer | 18.1 | 160 |
| Pathfinder Vocational | 12.2 | 7 |
| Peabody | 19.2 | 212 |
| Pelham | 17.5 | 133 |
| Pembroke | 20.3 | 289 |
| Pentucket | 20.5 | 298 |
| Petersham | 16.3 | 81 |
| Pioneer Valley | 15.9 | 70 |
| Pioneer Valley Performing Arts Charter | 12.7 | 10 |
| Pittsfield | 16.6 | 92 |
| Plainville | 21.4 | 331 |
| Plymouth | 18 | 153 |
| Plympton | 15.8 | 66 |
| Prospect Hill Academy Charter | 22.2 | 349 |
| Provincetown | 8 | 2 |
| Quabbin | 18.8 | 198 |
| Quaboag | 18.5 | 182 |
| Quincy | 19.4 | 233 |
| Ralph Mahar | 14.6 | 37 |
| Randolph | 27.8 | 373 |
| Reading | 20.4 | 293 |
| Revere | 20.1 | 283 |
| Richmond | 16.2 | 76 |
| Rising Tide Charter | 19 | 205 |
| River Valley Charter | 19.2 | 212 |
| Rochester | 19.1 | 210 |
| Rockland | 19.3 | 222 |
| Rockport | 14.7 | 39 |
| Roxbury Preparatory Charter | 24.4 | 365 |
| Sabis International Charter | 25.8 | 367 |
| Salem | 15.6 | 64 |
| Salem | 8.6 | 3 |
| Salem Academy Charter | 15.9 | 70 |
| Sandwich | 18.7 | 193 |
| Saugus | 19.8 | 255 |
| Savoy | 5.7 | 1 |
| School district | Class size, 2011-2012 | Rank |
| Scituate | 18.9 | 201 |
| Seekonk | 20.1 | 283 |
| Seven Hills Charter | 26.3 | 369 |
| Sharon | 18.1 | 160 |
| Shawsheen Valley Vocational | 17.9 | 150 |
| Sherborn | 17.3 | 125 |
| Shrewsbury | 22 | 343 |
| Shutesbury | 14.9 | 46 |
| Silver Lake | 19.8 | 255 |
| Smith Leadership Academy Charter | 16.4 | 86 |
| Somerset | 20.2 | 285 |
| Somerville | 17.8 | 147 |
| Southampton | 18.2 | 167 |
| Southborough | 18.7 | 193 |
| Southbridge | 19.5 | 238 |
| Southeastern Vocational | 15 | 48 |
| Southern Berkshire | 12.8 | 12 |
| Southern Worcester Vocational | 13.4 | 19 |
| South Hadley | 16.7 | 97 |
| South Middlesex Vocational | 14.4 | 31 |
| South Shore Charter | 18 | 153 |
| South Shore Vocational | 13.3 | 17 |
| Southwick-Tolland | 18.9 | 201 |
| Spencer-East Brookfield | 18.7 | 193 |
| Springfield | 17.3 | 125 |
| Stoneham | 16.5 | 90 |
| Stoughton | 17.2 | 121 |
| Sturbridge | 21.8 | 340 |
| Sturgis Charter | 15.4 | 59 |
| Sudbury | 20.5 | 298 |
| Sunderland | 16.6 | 92 |
| Sutton | 19.8 | 255 |
| Swampscott | 21 | 319 |
| Swansea | 16.8 | 100 |
| Tantasqua | 15 | 48 |
| Taunton | 21 | 319 |
| Tewksbury | 20.6 | 304 |
| Tisbury | 17.1 | 113 |
| Topsfield | 15.8 | 66 |
| Tri-County Vocational | 17.5 | 133 |
| Triton | 18.4 | 179 |
| Truro | 19.2 | 212 |
| Tyngsboro | 20.3 | 289 |
| Tyngsborough | 20.3 | 289 |
| Up-Island | 13.6 | 23 |
| Upper Cape Cod Vocational | 15.8 | 66 |
| Uxbridge | 19.5 | 238 |
| Wachusett | 19.2 | 212 |
| Wakefield | 19.3 | 222 |
| Wales | 14.9 | 46 |
| Walpole | 21 | 319 |
| Waltham | 16.1 | 74 |
| Ware | 21.5 | 334 |
| Wareham | 17.3 | 125 |
| Watertown | 17.1 | 113 |
| Wayland | 18 | 153 |
| Webster | 20 | 277 |
| Wellesley | 17.4 | 129 |
| Wellfleet | 13.3 | 17 |
| Westborough | 16.4 | 86 |
| West Boylston | 17.8 | 147 |
| West Bridgewater | 19.7 | 249 |
| Westfield | 18.2 | 167 |
| Westford | 18.7 | 193 |
| Westhampton | 16.8 | 100 |
| Weston | 22.6 | 351 |
| Westport | 19.9 | 266 |
| West Springfield | 15.5 | 62 |
| Westwood | 18.6 | 187 |
| Weymouth | 20.7 | 309 |
| Whately | 13.6 | 23 |
| Whitman-Hanson | 23 | 356 |
| Whittier Vocational | 12.7 | 10 |
| Williamsburg | 18.3 | 174 |
| Williamstown | 16.9 | 106 |
| Wilmington | 19.5 | 238 |
| Winchendon | 19.9 | 266 |
| Winchester | 19.8 | 255 |
| Winthrop | 18.8 | 198 |
| Woburn | 17.4 | 129 |
| Worcester | 16.6 | 92 |
| Worcester | 19.3 | 222 |
| Wrentham | 20.4 | 293 |