New York: Yes
Los Angeles: No
Chicago: Yes
Houston: Yes
Philadelphia: Yes
Phoenix: No
San Antonio: No
San Diego: No
Dallas: No
San Jose: No. I’m not sure I even know the way there.
Austin: No
Indianapolis: No
Jacksonville (FL): Yes
San Francisco: No
Columbus: No
Charlotte: Yes
Fort Worth: No
Detroit: No
El Paso: No
Memphis: No
New York: Yes
Los Angeles: No
Chicago: Yes, live here. 
Houston: No
Philadelphia: Yes
Phoenix: No
San Antonio: No
San Diego: No
Dallas: No
San Jose: No
Austin: No
Indianapolis: No
Jacksonville: No
San Francisco: No
Columbus: No
Charlotte: No
Fort Worth: No
Detroit: Yes
El Paso: No
Memphis: Passed through on train
To dispel any misperception that I’ve traveled little 
I’ve been to Washington DC, Boston, Seattle, St. Louis, and New Orleans. The first three strike me as being more “big cities” than Austin, Indianapolis, Jacksonville, or El Paso. :dubious: None of the latter have big-city transit systems to remotely rival the Boston T or DC Metrorail, for example. RTFirefly’s list of metro areas bears me out.
New York: Yes
Los Angeles: Yes
Chicago: No
Houston: No
Philadelphia: Yes
Phoenix: Yes
San Antonio: Yes
San Diego: Yes
Dallas: Yes
San Jose: Yes
Austin: No
Indianapolis: No
Jacksonville (FL): No
San Francisco: Yes
Columbus: No
Charlotte: No
Fort Worth: Yes
Detroit: No
El Paso: Yes
Memphis: No
So, eleven yes.
On RTFirefly’s list: 14
So here’s the top 20 CBSAs:
1 New York-Northern New Jersey-Long Island, NY-NJ-PA MSA - Going week after next
2 Los Angeles-Long Beach-Santa Ana, CA MSA - Yes
3 Chicago-Joliet-Naperville, IL-IN-WI MSA - Yes
4 Dallas-Fort Worth-Arlington, TX MSA - Yes
5 Houston-Sugar Land-Baytown, TX MSA - No
6 Philadelphia-Camden-Wilmington, PA-NJ-DE-MD MSA - No
7 Washington-Arlington-Alexandria, DC-VA-MD-WV MSA - Going next week
8 Miami-Fort Lauderdale-Pompano Beach, FL MSA - Yes
9 Atlanta-Sandy Springs-Marietta, GA MSA - Yes
10 Boston-Cambridge-Quincy, MA-NH MSA - Yes
11 San Francisco-Oakland-Fremont, CA MSA - Yes
12 Riverside-San Bernardino-Ontario, CA MSA - No
13 Detroit-Warren-Livonia, MI MSA - No
14 Phoenix-Mesa-Glendale, AZ MSA - No
15 Seattle-Tacoma-Bellevue, WA MSA - Yes
16 Minneapolis-St. Paul-Bloomington, MN-WI MSA - No
17 San Diego-Carlsbad-San Marcos, CA MSA - No
18 Tampa-St. Petersburg-Clearwater, FL MSA - Yes
19 St. Louis, MO-IL MSA - Yes
20 Baltimore-Towson, MD MSA - Yes
14 of 20 if I include the cities where I’m traveling over the next 20 days.
Depending on what list I am looking at between 10 and 16.
Hey, I’ve been to nine of those myself. 
New York: Yes
Los Angeles: Yes
Chicago: No (only a few layovers at O’Hare)
Houston: Yes
Philadelphia: Yes
Phoenix: No (only a layover on Southwest Airlines)
San Antonio: Yes
San Diego: Yes
Dallas: Yes
San Jose: No
Austin: Yes
Indianapolis: No
Jacksonville (FL): No
San Francisco: Yes
Columbus: No
Charlotte: No
Fort Worth: Yes
Detroit: No (only a few layovers on old Northwest Airlines)
El Paso: No
Memphis: Yes
Were you by chance travelling in the Rhine-Ruhr-area? Because this way you could’ve killed many birds with one stone from that list.
ETA: and what’s more important: have you been in Bielefeld?
New York: No
Los Angeles: Yes, lived there for 30 years
Chicago: No
Houston: No
Philadelphia: No
Phoenix: Yes
San Antonio: Yes
San Diego: yes
Dallas: No
San Jose: No
Austin: No
Indianapolis: No
Jacksonville (FL): Yes
San Francisco: Yes
Columbus: Yes
Charlotte: No
Fort Worth: No
Detroit: No
El Paso: No
Memphis: Yes
Most of those for me. But suspiciously, I’ve never been to Bielefeld.
New York: Yes
Los Angeles: Yes
Chicago: Yes
Houston: Yes
Philadelphia: Yes
Phoenix: Yes
San Antonio: Yes
San Diego: Yes
Dallas: Yes
San Jose: Yes
Austin: Yes
Indianapolis: Yes
Jacksonville (FL): No
San Francisco: Yes
Columbus: Yes
Charlotte: No
Fort Worth: No
Detroit: No
El Paso: No
Memphis: No
Ok, now is the time for the big confession: I’ve actually been twice in Bielefeld. First time, of all events, for a Santana concert. Second time, accompanying a friend checking out a Mercedes Benz like this for sale. The concert happened, the sale didn’t (mostly for matters of rust).
So naturally I think I travelled twice into another dimension. 
Crapped up the link for the Mercedes above, here it is: https://www.tw-sportsoft.de/TW_OnlineNennung/ADAC_KATHREIN_Rallye_2013/teilnehmer_images/FAHRZEUG_BILD_58999645_Hiemer_Groote_MercedesBenz_W110190DCHeckflosse.JPG
14/20 of the original US list, 18/20 of the CSBAs (missing Seattle and Houston)
5/20 of the Canadian list.
9/20 of the English list.
5/20 of the Scotland list.
The only other lists I could get are 2/20 for Spain and 1/20 for France (unless Parisian suburbs count as cities)
Hmm. I guess I’ve been to Los Angeles, San Diego, San Francisco, and may have passed through San Jose. Outside of California (I’ve lived in Washington for 47 years), the biggest cities I’ve been to have been Portland, OR and Seattle.
Same here.
Also, 9 of Canada’s.
Nine of ten largest in Portugal.
Seven of France.
Five of Spain.