You can join the two queries together to get their columns side-by-side:
select
sq1.DISTRICT
, sq1.CountOfDISTRICT
, sq2.[CountOfSite ID]
from (
... your first query here ...
) as sq1
inner join (
... your second query here ...
) as sq2
on sq1.DISTRICT = sq2.DISTRICT
The thing to remember is that unions are for joining tables/queries vertically, while joins are for joining them horizontally.