Area Code 636
Telephone Central Office Pictures

The following are representative examples of telephone central office buildings in Area Code 636 (Missouri).

Click on the pictures below for a larger version.

Antonia Photo 2	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: ANTOMO50RS2 Switch Type: Nokia/Alcatel/Lucent 5ESS EXM Prefixes Served: (636) 942, 948 Notes: Also serves part of the Antonia MCA rate center (636-942). This houses a remote hosted from the Fenton, MO CO 5ESS.
Cedar Hill	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: CDHLMO51RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS EXM Prefixes Served: (636) 274, 285 Notes: Also serves Cedar Hill MCA (636-274).  CO is located in east central Missouri. It houses a remote hosted by the Fenton, MO 5ESS switch. The building was built by the same firm which produced the Antonia office, the similarities are striking. Obviously, Cedar Hill has experienced more growth during the 80s and 90s as Hiway 30 was improved to a divided highway with limited access.
Chesterfield	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: CHFDMO52DSA Switch Type: Nokia/Alcatel/Lucent 5ESS Host Prefixes Served: (636) 247, 519, 530, 532, 536-7, 720, 730, 733, 735-7 Notes: This office was built in the middle of an empty field in the 1990 time frame. It was a single floor structure and it was built specifically to house the first 5ESS ISDN switch in Southwestern Bell. It provided ISDN services to the Advanced Technology lab of SBC and to the AT&T Network Systems (forerunner of Lucent) building at 1111 Woodsmill Road. Since that time much has been built around this office and, when it became necessary to add a second floor the city of “Town & Country” required a ton of aesthetic work to make the office fit into the residential setting. So they put on a fancy tin roof and a wall on the right side of the building which hides the emergency AC generator located there.
Defiance	Listing Updated: July 2010 Operating Company: Brightspeed/Centurylink CLLI: DFNCMOXARS2 Switch Type: Ribbon/Genband/Nortel RSS Prefixes Served: (636) 798, 987 Notes: Also serves Definace MCA (660-798). This town is another one founded by Daniel Boone and is west of Weldon springs, Missouri.
De Soto	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: DESTMOGIRS0 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (636) 337, 586 Notes: Also serves De Soto MCA (573-337). It houses a DMS remote hosted by the Festus DMS100. De Soto is a railroad town which has a large switchyard in it. This is an old photo, it now has the AT&T logo signage on it.
Eureka	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: EURKMO53RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (636) 587, 938 Notes: Also serves Eureka MCA (636-938).  It is home to a Remote Switch Module (RSM) hosted by the Chesterfield 5ESS switch. This area really took off in the last 35 years driven by the opening of the “Six Flags” amusement park and the development of a couple of golf course developments. It is one of the largest Remote Switch entities in the country.
Fenton Photo 2	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: FNTNMO54DS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (636) 305, 326, 343, 349, 717 Notes: Also serves Fenton MCA. This CO is located in St. Louis county. It houses a 5ESS switch which was installed in the second floor addition. This CO was home to 2 Exchanges DAvis for lowest call rates and DIamond for people who needed to call downtown St Louis a lot. When the Meramec river (a tributary of the Mississippi) gets high this office has to be protected from flooding.
Festus-Crystal City "Festus" Photo 2	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: FSTSMOYEDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (636) 931, 933, 937 Notes: Also serces Festus-Crystal City MCA (636-931). It is home to a DMS100 host switch. From the eastern side it appears to be a single story building but the view from the west shows that it is a 2 story building. Outside plant construction maintains a staff on the first floor of this building.
Grays Summit Photo 2	Listing Updated: October 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: GRSMMO55RS2 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (636) 451, 742 Notes: Also serves the Grays Summit MCA rate center. It houses a Remote Switch module hosted by the Chesterfield 5ESS. This is a small farming community west of St. Louis county. It is a cinder block building which has been painted with an unusual light blue paint.
Harvester	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: HVTRMO67DSA Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (636) 441-2, 447, 477, 498, 722, 851, 922, 926, 928, 936, 939 Notes: Also serves the Harvester MCA rate center.  It is the home to a DMS100 switch. This area has grown like weeds in the 1990s.
Herculaneum-Pevely "Pevely"	Listing Updated: August 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: PVLYMOAARS0 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (636) 475, 479 Notes: Also serves Herculaneum-Pevely MCA rate center (636-475).  This is a new building built to house the remote switch hosted by the DMS100 in Festus. Pevely is a familiar name in every St. Louis household since the dairy farm based there is still the largest in the eastern Missouri area. “White in the bottle, pink on the cheeks, pinky, pinky Pevely.” Was the old advertising motto.
High Ridge Photo 2	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: HGRGMO56RS2 Switch Type: Nokia/Alcatel/Lucent 5ESS EXM Prefixes Served: (636) 376, 677 Notes: Also serves High Ridge MCA rate center (636-677).  It houses an RSM hosted by the Fenton 5ESS switch. This area grew rapidly after Highway 30 was improved from a 2 lane road to divided, limited access highway in 1980. This once rural community is now a very popular bedroom community for St. Louis.
High Ridge "House Springs"	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: HGRGMO57RS2 Switch Type: Nokia/Alcatel/Lucent 5ESS RSM Prefixes Served: (636) 375, 671 Notes: Also serves House Springs MCA (636-671). This houses an RSM which is hosted by the Maxville 5ESS. It should have been hosted by the Fenton 5ESS but that switch was not ready in time to host this replacement for the old Step by Step switch. This was an old farm agency building for the early Southwestern Bell Telephone Company. It was an old farm house in which the wife and children worked for SWBT as operators on a manual switch board until automatic dialing via Step by Step was invented. The building has no indoor plumbing, hence the portable toilet out front. When the RSM was placed in the 1980s, SWBT had to dig a basement under the CO for the power plant.
Hillsboro (AT&T LL) Photo 2 | Photo 3	Listing Updated: July 2010 Operating Company: AT&T (Long Lines) CLLI: (unknown) Switch Type: (Unknown) Prefixes Served: (Unknown) Notes: Long-Lines (long distance network) facility.
Hillsboro	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: HLBOMO66RS1 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (636) 789, 797 Notes: Also serves Hillsburo MCA (636-797). This office houses a remote switch hosted by the DMS100 in Festus, MO. Hillsboro is the county seat for Jefferson county.
Imperial	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: IMPRMO58RS2 Switch Type: Nokia/Alcatel/Lucent 5ESS EXM Prefixes Served: (636) 461, 464, 467, 525 Notes: It houses a remote switch module hosted by the Maxville 5ESS switch. It is a prime example of Telephone architecture in the 1970s, no windows, no ornamentation, no business office, purely functional building space.
Jonesburg (SBC/AT&T Repeater)	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: JNBGMORS? Switch Type: None Prefixes Served: None Notes: This building is not in an area served by AT&T, it is one of many old repeater stations which Southwestern Bell built back in the 50s and 60s for their far flung interoffice facility network. This building started life as the small portion on the right side of the photo and has been grown twice as you can see looking at the roofline or the brickwork. The SBC folks wanted to divest of most of these in the 1980s as they started fiber optic deployments in the IOF network but could not find buyers. It turned out to be a great thing as they started to deploy SONET rings throughout the network in the 1990s and these provided ideal hubbing and interconnection points.
Manchester Photo 2	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: MNCHMO59DS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (636) 207, 227, 230, 256, 386, 391, 394, 527, 891 Notes: It is situated in West St. Louis county and houses a 5ESS switch. There are only a few 5ESS Optical Remote Modules which have ever been “rehomed”, on of them is now hosted in this office. When ISDN service was first turned up in St. Louis the VP of Lucent in this location needed to have ISDN service so he could interact with the president & CEO of SWBT over ISDN lines so the ORM at that site was hosted by the Chesterfield 5ESS switch. Only Lucent lines were to be assigned to that ORM but, over time, residential and business customers in adjoining properties got assigned to it. When the building had to be demolished for a shopping center the remote had to be rehomed on the nearest 5ESS in the rate center boundaries and that is Manchester.
Marthasville	Listing Updated: July 2010 Operating Company: Brightspeed/Centurylink CLLI: MTVLMOXARS0 Switch Type: Ribbon/Genband/Nortel RSC Prefixes Served: (636) 242, 433 Notes: Also serves Marthasville MCA (636-242). A CO in estern Missouri.
Maxville	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: MXVLMO60DSA Switch Type: Nokia/Alcatel/Lucent 5ESS Host Prefixes Served: (636) 282, 287, 296 Notes: Also serves Maxville MCA. It is home for a 5ESS switch which hosts the House Springs, Missouri remote switch. This switch is in Maxville but serves the much larger town of Arnold. This blond brick is not very common in AT&T.
O'Fallon	Listing Updated: July 2010 Operating Company: Brightspeed/Centurylink CLLI: OFLNMOXADS0 Switch Type: Ribbon/Genband/Nortel DMS-100/200 Prefixes Served: (636) 240, 272, 281, 379, 474, 978, 980 Notes: It is located south of Wentzville and is relatively new, less than 15 years old. The sign on the building has now been changed to Brightspeed/Centurylink.
Pacific	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: PCFCMO61RS0 Switch Type: Nokia/Alcatel/Lucent 5ESS EXM Prefixes Served: (636) 257, 271 Notes: Also serves Pacific MCA. This office houses a remote switch hosted by the Valley Park 5ESS switch. Pacific is a little farm town west of Eureka, MO.
Pond	Listing Updated: August 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: PONDMO62RS4 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (636) 273, 405, 422, 458 Notes: Also serves Pond MCA. It houses an RSM hosted by the Chesterfield 5ESS. This office is just west of Manchester but is extremely difficult to find. This is the front entrance of the building but it does not face the road it is on, from the road all you see is a driveway to largish building which stands with its back to you. The only giveaway is an occasional AT&T truck parked in the lot in front of the office. I have never seen another AT&T CO that remotely resembles it.
St. Charles	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: STCHMO63DSA Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (636) 255, 443, 723-4, 896, 916, 925, 940, 946-7, 949 Notes: Houses a Nortel DMS100 switch and serves the St. Charles county seat. The office is the toll collection center for all traffic from Northeast Missouri. It is built on a heavily sloped street so that from one view it appears to be a 4 story building but from the other corner, only a hundred yards north, it appears to be a 3 story building. Saint Charles was the first capitol city of the state of Missouri being displaced by Jefferson City after the capitol building there was finished.
St. Clair	Listing Updated: August 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: STCLMOMARS0 Switch Type: Nokia/Alcatel/Lucent 5ESS EXM Prefixes Served: (636) 322, 629 Notes: Also serves St. Clair MCA (636-322).  It houses a remote switch hosted by the Valley Park 5ESS switch. The pay phone no longer exists there.
Union	Listing Updated: July 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: UNINMOLURS0 Switch Type: Nokia/Alcatel/Lucent 5ESS EXM Prefixes Served: (636) 583-4, 744 Notes: Also serves Union MCA (636-744). A 5ESS remote hosted by Valley Park CO. Office used to host operators in the early days, and the reason for the windows.
Valley Park Photo 2	Listing Updated: August 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: VYPKMO64DS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (636) 225-6, 517, 529, 825, 827, 861 Notes: Also serves Valley Park MCA. Office houses a No. 5 ESS switch. The town was a resort for the rich of St. Louis in the late 1890s and early 1900s. It suffered a long slide until about 20 years ago, when the Corps of Engineers figured out that they needed to stop people from rebuilding houses on the Merrimac river after floods. The town is positively robust now and a huge amount of new housing has new access and/ or DSL lines from this central office.
Washington	Listing Updated: August 2010 Operating Company: at&t/SBC/Southwestern Bell CLLI: WASHMOBERS0 Switch Type: Nokia/Alcatel/Lucent 5ESS EXM Prefixes Served: (636) 221, 239, 390, 432 Notes: Also serves Washington MCA (636-432). This office houses an RSM hosted by the Valley Park 5ESS. In December 2009 Uverse became available for subscribers in this Missouri river town. The top floor was added for a 2BESS switch which was subsequently replaced by the remote switch module.
Wentzville	Listing Updated: July 2010 Operating Company: Brightspeed/Centurylink CLLI: WNVLMOXADS0 Switch Type: Ribbon/Genband/Nortel DMS-100/200 Prefixes Served: (636) 327, 332, 639 Notes: Also serves Wentzville MCA (636-332). It serves Wentzville, the home of the GM plant in eastern Missouri.
Wright City (AT&T Long Lines) Photo 2	Listing Updated: August 2013 Operating Company: at&t Long Lines CLLI: WRCYMOORRS1 Switch Type: None Prefixes Served: None Notes: This is the Wright City, MO AT&T repeater station. It sits in an area served by Century Link. It is difficult to see that this is a cinder block building because of the application of a thick paint like material 7 or 8 years ago. Directly behind the photographer is an old AT&T Long Lines Radio building almost identical to the old Kingdom City, MO building. It now belongs to a bank and is beautifully maintained and landscaped.