Table:
text: List of Massachusetts locations by per capita income
Counties
Counties
County Per_capita_income Median_household_income Median_family_income Population Number_of_households
Nantucket $51,456 $84,979 $89,236 10135 3745
Norfolk $43,685 $83,733 $106,309 666426 255944
Middlesex $41,453 $79,691 $100,267 1491762 577349
Barnstable $36,000 $60,525 $76,708 216639 96775
Massachusetts $35,051 $65,981 $83,371 6512227 2522409
Essex $34,858 $65,785 $83,047 739505 284940
Plymouth $34,285 $74,698 $88,110 492934 178996
Dukes $33,228 $69,760 $82,659 16353 5568
Suffolk $32,034 $51,638 $60,342 713089 286437
Worcester $31,470 $65,772 $81,342 794981 299089
Berkshire $29,387 $48,705 $64,393 131221 55793
Hampshire $29,113 $60,331 $82,999 157630 58921
Bristol $28,682 $55,813 $71,416 547305 210536
Franklin $28,313 $52,246 $65,713 71495 30362
United States $27,915 $52,762 $64,293 306603772 114761359
Hampden $25,363 $48,866 $61,800 462752 177954

Question: Among the locations in the list of places in Massachusetts by per capita income, what is the population of each county with a median income of $69,760?