S
- SAB - St. Albans, Vermont
- SAC - Sacramento, California 'I' Street Station
- SAD - Seaford, Delaware
- SAF - Santa Fe, New Mexico
- SAL - Salisbury, North Carolina
- SAM - San Antonio, Texas - (ex-MoPac) - inactive
- SAN - San Diego, California
- SAO - Saco, Maine
- SAP - Santa Paula, California
- SAR - Saratoga Springs, New York
- SAS - San Antonio, Texas - (ex-SP)
- SAT - Santa Maria, California
- SAV - Savannah, Georgia
- SBA - Santa Barbara, California
- SBB - San Bernardino - Bus Stop, California
- SBG - Sebring, Florida
- SBY - Shelby, Montana
- SCA - St. Catharines, Ontario, Canada
- SCC - Santa Clara, California, also served by ACE & Caltrain
- SCD - St. Cloud, Minnesota
- SCH - Schriever, Louisiana
- SCS - Sacramento, California State Capitol Drop Off Only
- SCZ - Santa Cruz, California
- SDL - Slidell, Louisiana
- SDY - Schenectady, New York
- SDZ - San Diego, California Zoo Bus Stop
- SEA - Seattle, Washington
- SED - Sedalia, Missouri
- SFA - Sanford, Florida Auto Train Only
- SFC - San Francisco, California Ferry Bldg
- SFD - Sanford, Florida Regular Trains
- SFF - San Francisco, California Financial Ctr
- SFM - San Francisco, California Moscone Center
- SFP - San Francisco, California Peninsula Line
- SFS - San Francisco, California Union Square
- SFW - San Francisco, California Fisherman's Wharf
- SHR - Shreveport, Louisiana
- SIM - Simi Valley, California
- SJC - San Jose, California, also served by ACE & Caltrain
- SJM - St. Joseph, Michigan
- SKN - Stockton, California
- SKT - Stockton - ACE Station, California
- SKW - Skykomish, Washington
- SKY - Sandusky, Ohio
- SLC - Salt Lake City, Utah
- SLG - Salem, Oregon Greyhound Station
- SLH - Stateline - Harvey's, California
- SLM - Salem, Oregon
- SLO - San Luis Obispo, California
- SLP - San Luis Obispo, California Cal Poly
- SLQ - St. Lambert, Quebec, Canada
- SLT - South Lake Tahoe, California
- SLV - Solvang, California
- SLY - Salisbury, Maryland
- SMC - San Marcos, Texas
- SMD - Madison, Wisconsin Madison - South
- SMT - Summit, Illinois
- SNA - Santa Ana, California
- SNB - San Bernardino, California
- SNC - San Juan Capistrano, California
- SND - Sanderson, Texas
- SNP - San Clemente, California
- SNS - Salinas, California
- SOB - South Bend, Indiana
- SOD - Soda Springs, California
- SOL - Solana Beach, California
- SOP - Southern Pines, North Carolina
- SPB - Spartanburg, South Carolina
- SPD - San Pedro, California
- SPG - Springfield, Massachusetts
- SPI - Springfield, Illinois
- SPK - Spokane, Washington
- SPL - Staples, Minnesota
- SPM - South Portsmouth, Kentucky
- SPO - San Pedro, California Bus Stop
- SPR - Sparks, Nevada
- SPT - Sandpoint, Idaho
- SPX - Sparks, Nevada Bus Station
- SQA - Squamish, British Columbia, Canada
- SRA - Sarasota, Florida
- SRC - Santa Rosa, California
- SRO - Socorro, New Mexico
- SRT - Searsport, Maine
- SSD - Seaside, Oregon
- SSM - Selma-Smithfield, North Carolina
- SSW - Stevens Pass, Washington
- STA - Staunton, Virginia
- STG - St. George, Utah
- STI - St. Ignace, Michigan
- STL - St. Louis, Missouri
- STM - Stamford, Connecticut - Acela Express - Regional - Vermonter
- STN - Stanley, North Dakota
- STP - St. Petersburg, Florida
- SUI - Suisun-Fairfield, California
- SUN - Sunriver, Oregon
- SUY - Surrey, British Columbia, Canada
- SVF - Seattle, Washington Ferry Pier 69
- SVT - Sturtevant, Wisconsin
- SVY - Scotts Valley, California
- SYR - Syracuse, New York
Read more about this topic: List Of Amtrak Station Codes