CREATE TABLE table_22491 ("Township" CLOB, "County" CLOB, "Pop.  ( 2010 ) " FLOAT, "Land  (  sqmi  ) " CLOB, "Water  ( sqmi ) " CLOB, "Latitude" CLOB, "Longitude" CLOB, "GEO ID" FLOAT, "ANSI code" FLOAT)

Name the number of county for 90 population
SELECT COUNT("County") FROM table_22491 WHERE "Pop. (2010)" = '90'
SELECT COUNT("County") FROM "table_22491" WHERE "Pop. (2010)" = '90'