Colorado. Population 17 east slope counties lose population in last 10 years. RMN My 2&, 1970 p.45 Colorado's population 2,180,215, breakdown of tons. Post de 21, 1970 p.29 State gains population 3 times faster than 9.4% average Post Jy 5, 1970 p.23 Grew 25% 1970 census discloses. RMN s 2, 1970 p.5 Population count gives Colorado 5th member in House. RMN D 1, 1970 p.5 0