Economic Policy Institute, 10 most expensive cities to raise a family.

MarketWatch staffer Catey Hill taps the data well at the Economic Policy Institute to profile America's 10 most-expensive places to raise a family.

The study looked at 618 metro areas and calculated the cost of living in each based on the costs of housing, child care, food, transportation, health care and other necessities (such as school supplies and clothing), as well as taxes.

Hill writes:

Child care is the single most expensive line item for these families: In 500 of the 618 areas that EPI looked at, child care was parents’ biggest annual expense, averaging about $12,500 a year nationwide and climbing above $30,000 a year in one city.

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