Colony Systems, Worlds, and Cities of the UNSC

-Sol System-

Earth - Homeworld to Humanity, currently under attack/conquered in Africa by Covenant.
New Mombasa, Kenya
Old Mombasa, Kenya
Songnam, Korea
HighCom Facility Bravo-6 - Sydney, Australia
Diego Garcia
Zanzibar Island
Chawla Base - Boston, North America
Luna
Luna OCS Academy

Mars
Chiron
Argyre Planitia
Reyes-McLees Shipyards
New Legaspi

Jupiter
Jovian Moons

-Epsilon Eridani System-

Reach - Primary military installation. Glassed by Covenant in 2552.
Highland Mountains
CASTLE Base
Camp Hathcock
Camp Independence
Fairchild Field
HighCom Armory Omega
Military Reservation 01478-B
Military Wilderness Training Preserve
ODG Facility A-331
Olympic Tower
Reach Station Gamma
Reach Naval Academy

Beta Gabriel

-Sigma Octanus System-

Sigma Octanus IV - Unknown
Côte d'Azur

-Eridanus Star System-

Eridanus II - Glassed in 2530
Elysium City
Luxor Spaceport

Helgard - Glassed in 2552
ONI III Staging Area

-Lambda Serpentis System-

Jericho VII - Glassed in 2535

Harvest System

Harvest - Glassed by Covenant in 2525

-Chi Ceti System-

Chi Ceti IV -Unknown
Damascus Testing Facility

-Hellespont System-

Troy - Glassed

-111 Tauri System-

Victoria - Unknown

-Zeta Doradus System-

Onyx

-Other Colonies-

Biko - Glassed in 2525
Durban
Emerald Cove - Glassed in 2542
Harmony - Glassed
New Harmony - Unknown
Draco III - Glassed
Paris IV - Glassed
Charybdis IX - Unknown
Minister - still held by UNSC
Hydra System - Unknown
Gilgamesh - Unknown
Coral - Attacked by Covenant in 2552, unknown/glassed
New Constantinople - Glassed
Tantalus - Unknown
Mamore - still held by UNSC
Crystal - still held by UNSC
Groombridge 34 System - Unknown
Atlas Moons - still held by UNSC
Far Isle - Unknown
Miridem - Unknown
Mariposa-Unknown

-UNSC bases-

Fort York
Roosevelt Military Base

Credit to The Hegemon for the entire list.