USA.gov – Federal government official web portal and agency directory
WhiteHouse.gov – Executive orders, presidential actions, and administration priorities
Congress.gov – Legislation, bill status, and congressional records
Constitution.congress.gov – U.S. Constitution and founding documents
GovInfo.gov – Official federal publications, CFR, and Federal Register archives
Oversight.gov – Inspector General reports and findings
Archives.gov – National Archives and Records Administration
USGovernmentManual.gov – Official directory and organizational reference for federal agencies
Justice.gov – FOIA policy guidance and legal opinions from the Department of Justice
Loc.gov – Legislative history and federal records from the Library of Congress

OMB.gov - Office of Management and Budget - budget guidance, OMB Circular A-11, regulatory review
USASpending.gov - Federal spending transparency - contracts, grants, obligations, outlays
CBO.gov - Congressional Budget Office - budget projections, economic analysis
GAO.gov - Government Accountability Office - audits, reports, Red Book
Treasury.gov - Department of the Treasury
Fiscal.treasury.gov - Bureau of the Fiscal Service - payments, collections, debt management
FiscalData.treasury.gov - Treasury's public data platform - Debt to the Penny and related datasets
TFX.treasury.gov - Treasury Financial Experience - financial management resources
FPI.omb.gov - Federal Program Inventory

FederalRegister.gov - Daily Federal Register — proposed and final rules, notices, presidential documents
eCFR.gov - Electronic Code of Federal Regulations
Regulations.gov - Federal rulemaking portal - submit and search public comments
RegInfo.gov - Unified Agenda - regulatory pipeline, OIRA review information
Acquisition.gov - Federal Acquisition Regulation (FAR) and acquisition policy

Performance.gov - Agency Priority Goals, Cross-Agency Priority Goals, strategic plans, performance data
Councils.gov - Federal Executive Councils and interagency coordination bodies

Grants.gov - Federal grant opportunities and application portal
SAM.gov - System for Award Management - vendor registration, assistance listings, contract awards

OPM.gov - Office of Personnel Management - HR policy, benefits, hiring
USAJobs.gov - Official federal government job board
MSPB.gov - Merit Systems Protection Board - employee appeals
OSC.gov - Office of Special Counsel - whistleblower protection, Hatch Act enforcement
OGE.gov - Office of Government Ethics - ethics rules, financial disclosure
CHCOC.gov - Chief Human Capital Officers Council
BLS.gov - Bureau of Labor Statistics - wage and locality pay data

Senate.gov - U.S. Senate - members, committees, rules, leadership
House.gov - U.S. House of Representatives - members, committees, rules, leadership
ArmedServices.house.gov - House Armed Services Committee - NDAA and defense oversight
Uscode.house.gov - Office of Law Revision Counsel - United States Code

SupremeCourt.gov - Supreme Court of the United States - opinions, orders, docket
USCourts.gov - Federal Judiciary - court structure, rules, resources

CISA.gov - Cybersecurity and Infrastructure Security Agency
DHS.gov- Department of Homeland Security
HHS.gov - Department of Health and Human Services
OIG.HHS.gov - HHS Office of Inspector General
GSA.gov - General Services Administration
USSM.gsa.gov - Unified Shared Services Management - QSMO marketplace
FacaDatabase.gov - Federal Advisory Committee database
IGNet.gov - Council of Inspectors General on Integrity and Efficiency
IRS.gov - Internal Revenue Service
DOL.gov - Department of Labor
FederalReserve.gov - Federal Reserve
Login.gov - Shared federal digital identity platform
DOI.gov - Department of the Interior
FOIA.gov - DOJ FOIA portal, including the FOIA wizard tool

OpenSecrets.org - Center for Responsive Politics - lobbying and campaign finance data
PresidentialTransition.org - Partnership for Public Service - Center for Presidential Transition
PGPF.org - Peter G. Peterson Foundation - federal budget and fiscal policy
FactCheck.org - Annenberg Public Policy Center
NASBO.org- National Association of State Budget Officers
PewResearch.org - public trust in government polling
Gallup.com - public opinion and governance polling
USAfacts.org- government data simplified