Count specific number in a range

Dears,

I have an excel sheet that has customer records. the customer records are sorted out by branch number...like:

501 customer A
501 Customer B
501 Customer C
502 Customer D
502 Customer E
503 Customer F
504 Customer G
504 Customer G

And I would like to know the number of records each branch has via formula. I used count IF, COUNTIF(range, criteria) and I got the value for branch 501. how can drag and get a result that looks like

Branch 501 502 503 504
records 3 2 1 2

Thank you very much.