The state of Colorado requires the professional engineer stamp to be 1 5/8 inches in diameter. We offer the Colorado professional engineer stamp in one size; 1 5/8 inches.
In case you have any questions on the Colorado professional engineer stamp requirements or any other regulatory questions, we have included the Colorado Engineer boards contact information below for your convenience.
Colorado State Board:
Colorado Department of Regulatory Agencies
1560 Broadway, Suite 110
Denver, CO 80202