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Illinois is a state in Great Lakes and the Midwest United States of America.

Percy Jackson and the Olympians

The Lightning Thief

When enroute to the Underworld, Percy Jackson, Annabeth Chase, and Grover Underwood cross the Mississippi River from the Illinois side into St. Louis on the Missouri side.

The Heroes of Olympus

The Lost Hero

When enroute to the Wolf House, Jason Grace, Piper McLean, and Leo Valdez stop in Chicago and encourage Medea in her Department Store.

Rick Riordan Presents

Tristan Strong Punches a Hole in the Sky

Tristan Strong is from Chicago. He is in his bedroom before leaving with his grandparents to their farm in Alabama.

Locations (CHB)
Magical Locations: Aeolia | Camp Fish-Blood | Camp Half-Blood | Camp Jupiter | Cave of Trophonius | C.C.'s Spa and Resort | Daedalus' Workshop | Lotus Hotel and Casino | Mount Othrys | Ogygia | Olympus | Pan's Cave | Tarquin’s Tomb | Sea of Monsters | The Labyrinth | Tartarus | Underworld | Waystation
Cities and Towns: Atlanta | Athens | Anchorage | Bar Harbor | Berkeley | Bologna | Buford | Charleston | Chesapeake Beach | Chicago | Colorado Springs | Denver | Detroit | Évora | Gila Claw | Houston | Indianapolis | Jamestown | Keeseville | Los Angeles | Las Vegas | Leeds Point | Miami | Montauk | Nashville | New Orleans | New York City | Oakland | Omaha | Palm Springs | Paris | Quebec City | Richmond | Rome | San Francisco | San Juan | Santa Monica | Seward | Sparta | St. Augustine | St. Louis | Tahlequah | Vancouver | Venice | Virginia Beach | Washington, D.C. | Westport
Administrative Divisions: Alaska | Arizona | British Columbia | California | Colorado | Connecticut | Dalmatia | Florida | Georgia | Illinois | Indiana | Kansas | Louisiana | Maine | Maryland | Michigan | Missouri | Nebraska | Nevada | New Jersey | New Mexico | New York | Ohio | Oklahoma | Oregon | Puerto Rico | Quebec | South Carolina | Tennessee | Texas | United States Virgin Islands | Utah | Virginia | Washington
Countries: Canada | Croatia | France | Greece | Italy | Portugal | United States of America
Continents: Africa | Europe | North America
Other Locations: Atlantic Ocean | Apennine Mountains | Aunty Em's Gnome Emporium | Caldecott Tunnel | Calvert Peninsula | Caribbean Sea | Carlsbad Caverns | Central Park | Crusty's Water Bed Palace | Empire State Building | Gateway Arch | Grand Canyon | Hoover Dam | Junkyard of the Gods | Mediterranean Sea | Mississippi River | Mount Diablo | Mount Etna | Mount Saint Helens | Mount Tamalpais | Oakland Airport | Panama Canal | Pacific Ocean | Pikes Peak | Plaza Hotel | Polyphemus' Island | Rocky Mountains | Rainbow Organic Foods & Lifestyles | Roman Empire | St. Thomas | Triple G Ranch | Waterland
Locations (RRP)
Cities and Towns: Atlanta | Cabo San Lucas | Chicago | Los Angeles | Loves Park | Miami | New York City | San Diego | San Miguel de Allende | Yuma
Administrative Divisions: Alabama | Arizona | Baja California Sur | California | Chiapas | Connecticut | Florida | Georgia | Guanajuato | Illinois | Kentucky | New Jersey | New Mexico | New York | Quintana Roo
Landmarks and other Buildings: Beverly Hills Hotel | Georgia Aquarium | Museum of Ancient Indian Art and Culture
Countries: Mexico | United States of America
Continents: North America
Pandava Quartet: Amaravati | Court of the Sky | Department of Many Voices | Kingdom of Death | Little India | Naga Realm | Night Bazaar | Ocean of Milk | Otherworld | Warehouse of Quest Materials
Storm Runner series: Aztlán | Baja California Peninsula | The Beast | Caribbean Sea | The Empty | Holy Ghost | Isla Holbox | Jazz’s Surf Shop | Mexica Empire | Mictlan | Old World | Pacific Ocean | Palenque National Park | Sea of Cortez | Tomb of the Red Queen | Venice Beach | Xib’alb’a
Dragon Pearl: Fourth Colony | Ghost Sector | Hongok | Hongok Spaceport | Jinju | Kim Dome | Outer Rim | Pale Lightning | Red Azalea | Thousand Worlds
Sal & Gabi series: Coral Castle | Culeco Academy of the Arts | Hospital | Little Havana | Multiverse
Tristain Strong series: Alke | Midpass | Strong Apartment | Strong family farm
Race to the Sun: House of the Sun | Intertribal Community Charter School
Paola Santiago series: Gila River
City of the Plague God: Manhattan
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