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Due to possible double-counting of physically-connected stations, the CTA's official 2015 tally of stations was 146, but for ridership purposes reported having only 143 stations.
References
"Monthly Ridership Report – December 2015" (PDF). Chicago Transit Authority Ridership Analysis and Reporting. January 11, 2016. Retrieved March 23, 2016. {{cite web}}: Cite has empty unknown parameter: |coauthors= (help)
"More Trains on Alley "L": Use Old Congress Station". Chicago Daily Tribune. March 9, 1902. p. 3.