Colorado Revised Statutes Title 8. Labor and Industry § 8-70-122. Employment--American employer

(a) The employer's principal place of business in the United States is located in this state; or

(b) The employer has no place of business in the United States but the employer is an individual who is a resident of this state; or the employer is a corporation which is organized under the laws of this state; or the employer is a partnership or a trust and the number of the partners or trustees who are residents of this state is greater than the number who are residents of any one other state; or

(c) None of the criteria of paragraphs (a) and (b) of this subsection (1) is met but the employer has elected coverage in this state or, the employer having failed to elect coverage in any state, the individual has filed a claim for benefits based on the service, under the law of this state.

(a) An “American employer” means an individual person who is a resident of the United States; or a partnership if two-thirds or more of the partners are residents of the United States; or a trust if all of the trustees are residents of the United States; or a corporation organized under the laws of the United States or of any state.

(b) “United States” includes the District of Columbia, the commonwealth of Puerto Rico, and the Virgin Islands.