CREATE TABLE "county" (
"County_Id" int,
"County_name" text,
"Population" real,
"Zip_code" text,
PRIMARY KEY ("County_Id")
)

CREATE TABLE "party" (
"Party_ID" int,
"Year" real,
"Party" text,
"Governor" text,
"Lieutenant_Governor" text,
"Comptroller" text,
"Attorney_General" text,
"US_Senate" text,
PRIMARY KEY ("Party_ID")
)

CREATE TABLE "election" (
"Election_ID" int,
"Counties_Represented" text,
"District" int,
"Delegate" text,
"Party" int,
"First_Elected" real,
"Committee" text,
PRIMARY KEY ("Election_ID"),
FOREIGN KEY (`Party`) REFERENCES `party`(`Party_ID`),
FOREIGN KEY (`District`) REFERENCES `county`(`County_Id`)
)
SELECT County_name FROM county ORDER BY Population ASC LIMIT 3
What are the 3 counties that have the smallest population? Give me the county names.