The homeless population under Mayor Bill de Blasio is soaring — with 4,000 more people in shelters than there were at the end of the Bloomberg era, according to data released Thursday.

There were 57,206 people housed in the facilities this week, compared with about 53,000 during former Mayor Mike Bloomberg’s final month in office in December 2013, the Mayor’s Management Report shows.

The number of families entering shelters has jumped 8 percent during the last fiscal year, while the single adult population has climbed 3.1 percent.

Shelter residents in all categories — single adults, families with children over 18 and families with younger kids — have stayed longer, the data show.

Adult families, in particular, stayed an average of 534 days, up 3.7 percent from the previous year’s average of 515 days.

Families with children were also more likely to return to the shelter system after having landed permanent housing, while single adults were less likely to return.

City Hall spokeswoman Ishanee Parikh insisted the city is dealing with an issue two decades in the making.

“This administration is systematically rebuilding and upgrading programs to prevent homelessness and help families and individuals exit shelter,” she said.