CHICAGO IX - CHICAGO'S GREATEST HITS by CHICAGO has sold 6,916,000 copies in Canada and United States.
CHICAGO IX - CHICAGO'S GREATEST HITS certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Canada |
300,000 | 3x Platinum | 1979 |
Canada Sales: 300,000
Certification / note: 3x Platinum
Certification Date / sales as of: 1979
|
 United States |
6,616,000 | 5x Platinum | 9 August, 1991 |
United States Sales: 6,616,000
Certification / note: 5x Platinum
Certification Date / sales as of: 9 August, 1991
|
| Total sales | 6,916,000 | (in 2 countries) |
Total
Sales: 6,916,000
(in 2 countries)
|
Year-end chart performance for CHICAGO IX - CHICAGO'S GREATEST HITS
| Chart 1975 | Rank |
| Canadian Albums (RPM) |
79 |
| Chart 1976 | Rank |
| Canadian Albums (RPM) |
13 |
| US Albums (Billboard 200) |
5 |