Filming Locations of Chicago and Los Angeles: Union Station Chicago

(0:00) Detective Lindsay At A Diner With Dr. Charles From Chicago Med / Bridgeport Restaurant; 3500 S. Halsted Street, Chicago
(0:06) Lindsay Going To See Her Mom At The Bar / Village Inn Bar; 4035 S. Wallace Street, Chicago
(0:10) Officers Gathering Outside Of The Police Station / 943 W. Maxwell Street, Chicago
(0:12) Trevor's House That Held The Women Hostage / 634 N. Rockwell Street, Chicago
(0:23) Arresting Trevor Outside Of Union Station / Southeast Corner Of S. Canal Street And W. Jackson Blvd, Chicago
(0:28) Arriving At The Brothel / 2519 S. Archer Avenue, Chicago
(0:30) Lindsay And Sarah's Father Talking To Sara At The CTA Station / Kimball Station For The Brown Line; 4755 N. Kimball Avenue, Chicago
(0:37) Dawson Meeting Olinski's Daughter At The Boxing Gym / 500 W. Cermak Road, Chicago (Note: This Was Set Up Inside Of A Warehouse)
(0:37) Olinsky Standing Outside Of His House / 114 Keystone Avenue, River Forest
(0:41) Outside Of Voight's House / 2137 W. Walton Street, Chicago

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Since ER Had 15 Seasons There Were Some Locations That Showed Up More Than One Time Throughout The Series. I Listed Them All Here Adding The Season Number And Episode Number For Each One.

(Season 1 Episode 11) Dr. Ross Feeling Sorry For Himself While Standing In Front Of The Water Tower / 806 N. Michigan Avenue, Chicago
(Season 3 Episode 14) Jeanie Boulet And Dr. Fischer Next To The Water Tower / 806 N. Michigan Avenue, Chicago
(Season 6 Episode 13) Dr. Greene With His Father / N. Michigan Avenue And E. Pearson Street, Chicago (Note: They Are On The Northwest Corner Of the Intersection)
(Season 1 Episode 13) Dr. Benton With His Mother / Bicentennial Plaza; 337 E. Randolph Street, Chicago
(Season 2 Episode 12) Dr. Greene And Dr. Lewis Ice Skating / Bicentennial Plaza; 337 E. Randolph Street, Chicago
(Season 2 Episode 1) Dr. Greene At The Train Station / Union Station; 225 S. Canal Street, Chicago
(Season 3 Episode 8) Dr. Greene Making It To Union Station But Still Missing His Train / 225 S. Canal Street, Chicago
(Season 11 Episode 2) Neela At Union Station / 500 W. Jackson Blvd, Chicago (Note: I Listed The Side Of The Building And Not the Main Address For This Scene)
(Season 2 Episode 19) Dr. Lewis At The Courthouse / Chicago Cultural Center; 78 E. Washington Street, Chicago
(Season 8 Episode 9) Dr. Benton Near The Courthouse / Chicago Culteral Center; 78 E. Washington Street, Chicago
(Season 2 Episode 19) Carter Being Dumped / Navy Pier; 600 E. Grand Avenue, Chicago
(Season 3 Episode 3) Dr. Greene And Dr. Lewis Meet At Navy Pier While Each Are On Their Date / 600 E. Grand Avenue, Chicago
(Season 5 Episode 6) Jeannie Boulet Is Jumping On A Trampoline / Navy Pier; 600 E. Grand Avenue
(Season 5 Episode 22) Dr. Greene And Dr. Corday Sitting In Front Of A Ferris Wheel / Navy Pier; 600 E. Grand Avenue, Chicago
(Season 9 Episode 6) Dr. Carter And Abby Eating At The Pier / Navy Pier; 600 E. Grand Avenue, Chicago
(Season 3 Episode 1) Dr. Ross And Dr. Greene Playing Handball / 501 S. Lake Shore Drive, Chicago (This Spot Is Straight East Of Buckingham Fountain But Has Since Been Removed)
(Season 4 Episode 4) Dr. Ross And Nurse Hathaway Go Rollerblading / 475 S. Lake Shore Drive, Chicago
(Season 5 Episode 21) Dr. Greene And Dr. Corday Playing Racquetball By The Lake / 475 Lakefront Trail, Chicago (Note: I Believe This Wall Has Since Been Removed)
(Season 3 Episode 2) Nurse Hathaway Riding Past Wrigley Field / 1060 W. Addison Street, Chicago
(Season 6 Episode 19) Dr. Kovac And Nurse Hathaway At Wrigley Field; 1060 W. Addison Street, Chicago
(Season 14 Episode 4) Dr. Gates Taking Joshua And His Mother To The Cubs Game / 1060 W. Addison Street, Chicago
(Season 3 Episode 20) Dr. Greene And Dr. Ross Playing Golf / Sydney Marovitz Golf Course; 3600 Recreation Drive, Chicago
(Season 9 Episode 7) Dr. Kovac Driving On A Golf Course To Find A Surgeon / Sydney Marovitz Golf Course; 3600 N. Recreational Drive, Chicago
(Season 5 Episode 8) Dr. Carter At A Car Lot Trying To Desperately Track Down A Patient / 521 N. Ashland Avenue, Chicago
(Season 6 Episode 19) Dr. Kovac And Nurse Hathaway Go To A Car Lot / MGM Auto; 521 N. Ashland Avenue, Chicago
(Season 5 Episode 22) Jeanie Boulet And Her Officer Friend Reggie At The Zoo / Lincoln Park Zoo; 1951 N. Stockton Drive, Chicago (Note: This Address Is Just West Of Where They Were At The Zoo)
(Season 13 Episode 4) Dr. Lockhart At The Park / 2610 N. Cannon Drive, Chicago (Note: This Is Part Of Lincoln Park Just North Of The North Pond)
(Season 6 Episode 2) Jeanie Boulet In Front Of A Police Station / 3600 N. Halsted Street, Chicago (Note: This Is No Longer An Active Police Station)
(Season 12 Episode 1) Sam And Luka Leaving The Police Station / 3600 N. Halsted Street, Chicago (Note: This Is No Longer A Working Police Station)
(Season 6 Episode 6) Nurse Hathaway Going To Meg's Workplace And Later Watches Meg Get Arrested / Deitch Pharmacy; 1800 W. Chicago Avenue, Chicago
(Season 11 Episode 10) The Gangsters Stopping At A Pharmacy To Get Supplies / 1800 W. Chicago Avenue, Chicago
(Season1 Episode 17) Dr. Ross Leaving Pamela's House / 859 N. Dearborn Street, Chicago
(Episode 23) Sarah's Grandparent's House / 859 N. Dearborn Street, Chicago