Chicago Marriott Oak Brook — Event Spaces, Floor Plans & Capacities

1401 W 22nd St, Oak Brook, IL 60523

Planning an event in Oak Brook? Chicago Marriott Oak Brook has 26 function rooms across 48,014 sq ft4,461 m² of function space. The largest room, Oak Brook Ballroom (A-H), hosts up to 1,250 guests. Capacity figures for every setup style are listed per room below.

Between them, the 26 rooms accommodate theater-style sessions for up to 1,200, seated banquets for 1,000 and standing receptions for 1,250. 11 smaller rooms suit breakouts and board meetings. Per-room dimensions and every published setup figure are listed below.

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Floor plans

Detailed floor plans for Chicago Marriott Oak Brook are published on the venue’s official site.

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Room capacities & dimensions

Room capacities and dimensions for Chicago Marriott Oak Brook
SpaceSq ft / m²CeilingBanquetTheaterClassroomReceptionConferenceU-Shape
Burr RidgePlan this room →336 sq ft31 m²10 ft3 m————12—
Elmhurst 1Plan this room →396 sq ft37 m²10 ft3 m334122441318
Elmhurst 2Plan this room →556 sq ft52 m²10 ft3 m465831611818
Elmhurst 3Plan this room →615 sq ft57 m²10 ft3 m516435682018
Elmhurst 4Plan this room →640 sq ft59 m²10 ft3 m536736712118
Foyer & Salons E-H (combined)Plan this room →3,600 sq ft334 m²10 ft3 m320300200250—55
La GrangePlan this room →850 sq ft79 m²10 ft3 m606045502420
LombardPlan this room →625 sq ft58 m²10 ft3 m505026452420
Marquis RoomPlan this room →2,100 sq ft195 m²8 ft2.4 m160150802004540
Oak Brook Ballroom (A-H)Plan this room →11,040 sq ft1,026 m²17 ft5.2 m1,0001,2007001,250——
Oak Brook RoomPlan this room →1,100 sq ft102 m²—40—————
Salon APlan this room →3,600 sq ft334 m²17 ft5.2 m320350200350—55
Salon BPlan this room →1,008 sq ft94 m²17 ft5.2 m8012070903530
Salon CPlan this room →1,008 sq ft94 m²17 ft5.2 m8012070903530
Salon DPlan this room →1,825 sq ft170 m²17 ft5.2 m1202251002005550
Salon EPlan this room →550 sq ft51 m²10 ft3 m404520402020
Salon FPlan this room →550 sq ft51 m²10 ft3 m404520402020
Salon GPlan this room →550 sq ft51 m²10 ft3 m404520402020
Salon HPlan this room →350 sq ft33 m²10 ft3 m202015201015
Salons A-D (combined)Plan this room →7,440 sq ft691 m²17 ft5.2 m6409005001,000——
Salons B & C (combined)Plan this room →2,015 sq ft187 m²17 ft5.2 m1602501202256055
Salons B, C & D (combined)Plan this room →3,840 sq ft357 m²17 ft5.2 m320450290575——
Villa ParkPlan this room →468 sq ft43 m²10 ft3 m————14—
WestchesterPlan this room →676 sq ft63 m²10 ft3 m505026452420
WheatonPlan this room →676 sq ft63 m²10 ft3 m505026452420
Additional spaces (dimensions only) (1)
Additional spaces with published dimensions only at Chicago Marriott Oak Brook
SpaceSq ft / m²Ceiling
Ballroom FoyerPlan this room →1,600 sq ft149 m²12 ft3.7 m

Figures from published venue data; blank cells mean the venue hasn’t published that number. Verify final counts with the venue.

Frequently asked questions

How many event spaces does Chicago Marriott Oak Brook have?
Chicago Marriott Oak Brook has 26 event spaces totaling 48,014 sq ft.
What is the largest event space at Chicago Marriott Oak Brook?
The largest event space at Chicago Marriott Oak Brook is Oak Brook Ballroom (A-H), which holds up to 1,250 guests across 11,040 sq ft.
What is the banquet capacity of Oak Brook Ballroom (A-H) at Chicago Marriott Oak Brook?
Oak Brook Ballroom (A-H) seats up to 1,000 guests in a banquet layout.
How many people fit in Oak Brook Ballroom (A-H) theater-style?
Oak Brook Ballroom (A-H) holds up to 1,200 guests in a theater setup.
What are the dimensions of Oak Brook Ballroom (A-H)?
Oak Brook Ballroom (A-H) measures 80 × 138 ft (11,040 sq ft) with 17 ft ceilings.

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