number of houses; number of households
我が町の戸数が増えている。
The number of households in our town is increasing.
台風で被害を受けた戸数は、５００を超えた。
The number of households affected by the typhoon exceeded 500.
新築マンションは１５０戸数になる予定だ。
The new condominium project is planned to have 150 units.