For the purpose of determining commercial zones, utilizing the general population-mileage formula as set forth in §372.241, each of the following combinations of cities shall be considered as a single municipality:

(a) Having a population equal to the sum of their combined populations, and

(b) Having boundaries comprised of their combined corporate limits, with the common portion thereof disregarded:   (1) Bluefield, Va.-W. Va.   (2) Bristol, Va.-Tenn.   (3) Davenport, Iowa, and Rock Island and Moline, Ill.   (4) Delmar, Del-Md.   (5) Harrison, Ohio-West Harrison, Ind.   (6) Junction City, Ark.-La.   (7) Kansas City, Mo.-Kansas City, Kans.   (8) Minneapolis-St. Paul, Minn.   (9) St. Louis, Mo.-East St. Louis, Ill.   (10) Texarkana, Ark.-Tex.   (11) Texhoma, Tex.-Okla.   (12) Union City, Ind.-Ohio.

[41 FR 56654, Dec. 29, 1976, as amended at 62 FR 15422, Apr. 1, 1997]