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Private foundations don’t post open calls, so nobody can search them. We read IRS filings instead — 9.6 million grants from 174,053 foundations and grantmaking charities, searchable by what the money was actually for.

12 funders with a record of paying for “mayors”

Where the money went

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The Bloomberg Family Foundation Inc → United Nations Development Programme: $14M across 11 grants, latest 2024Conrad N Hilton Foundation → Rockefeller Philanthropy Advisors Inc: $4.6M across 3 grants, latest 2024American Beverage Association → American Beverage Foundation for A Healthy America: $4.1M across 3 grants, latest 2024The Rockefeller Foundation → Reinvent Stockton Foundation: $1.3M across 2 grants, latest 2024Casey Family Programs → City of Seattle - Mayor's Office: $853K across 2 grants, latest 2023The Robert Wood Johnson Foundation → Mayors Fund for Los Angeles: $538K across 3 grants, latest 2023Annie E Casey Foundation Inc → Baltimore City Foundation Inc: $414K across 8 grants, latest 2023John D and Catherine T Macarthur Foundation (Consolidated) → The Mayor's Fund to Advance New York City: $400K across 2 grants, latest 2021David Bohnett Foundation → Regents of the University of California: $324K across 2 grants, latest 2024Justice Innovation Inc → Trustees of Columbia University in the City of New York: $303K across 1 grant, latest 2024Weingart Foundation → Mayor's Fund for Los Angeles: $225K across 5 grants, latest 2023Blue Cross of Idaho Foundation for → City of Rexburg: $3K across 3 grants, latest 2024The Bloomberg Family Foundation Inc → Mayor & City Council of Baltimore: $4.6M across 3 grants, latest 2023American Beverage Association → Us Conference of Mayors: $2.6M across 3 grants, latest 2024The Rockefeller Foundation → Trustees of Boston University: $950K across 4 grants, latest 2023Casey Family Programs → The Mayors Fund to Advance New York City: $750K across 1 grant, latest 2023Conrad N Hilton Foundation → Mayor's Fund for Los Angeles: $550K across 2 grants, latest 2022John D and Catherine T Macarthur Foundation (Consolidated) → The Mayor's Fund to Advance New York City: $300K across 2 grants, latest 2024Annie E Casey Foundation Inc → Baltimore Civic Fund: $290K across 1 grant, latest 2024The Robert Wood Johnson Foundation → Environmental Defense Fund: $277K across 1 grant, latest 2024Justice Innovation Inc → The Osborne Association: $219K across 1 grant, latest 2024David Bohnett Foundation → Ucla Luskin School of Public Affairs: $148K across 1 grant, latest 2022Weingart Foundation → United Way - Los Angeles: $65K across 1 grant, latest 2021Blue Cross of Idaho Foundation for → City of East Hope: $2K across 2 grants, latest 2024The Bloomberg Family Foundation Inc → United States Conference of Mayors: $4.3M across 3 grants, latest 2024The Rockefeller Foundation → Resources Legacy Fund: $750K across 2 grants, latest 2024Casey Family Programs → City of Seattle-Mayor's Office: $555K across 1 grant, latest 2024Conrad N Hilton Foundation → Conferencia De Superiores Mayores De Religiosos De Mxico Ar: $400K across 2 grants, latest 2024The Robert Wood Johnson Foundation → Resources Legacy Fund: $270K across 1 grant, latest 2024Annie E Casey Foundation Inc → Mayor's Healthy City Initiative: $250K across 2 grants, latest 2023Justice Innovation Inc → Jacob A Riis Neighborhood Settlement: $105K across 2 grants, latest 2022David Bohnett Foundation → Mayor's Fund for Los Angeles: $50K across 1 grant, latest 2022John D and Catherine T Macarthur Foundation (Consolidated) → National League of Cities Institute Inc: $50K across 1 grant, latest 2022Weingart Foundation → Mayors Fund for Los Angeles: $40K across 2 grants, latest 2024Blue Cross of Idaho Foundation for → City of Ferdinand: $2K across 2 grants, latest 2024The Bloomberg Family Foundation Inc → The Mayor's Fund to Advance New York City: $3.6M across 2 grants, latest 2024The Bloomberg Family Foundation Inc → The Education Culture and Neighborhood Renewal Company (Dba Hazira): $1.1M across 1 grant, latest 2023The Bloomberg Family Foundation Inc → City of Seattle's Office of the Mayor: $1.0M across 2 grants, latest 2024The Bloomberg Family Foundation Inc → City of Rotterdam: $1.0M across 3 grants, latest 2024The Bloomberg Family Foundation Inc → City of Rochester: $1.0M across 2 grants, latest 2024The Bloomberg Family Foundation Inc → City of Phoenix: $1.0M across 3 grants, latest 2024The Bloomberg Family Foundation Inc → City of Paterson: $1.0M across 3 grants, latest 2024The Bloomberg Family Foundation Inc → City of Vilnius: $1.0M across 3 grants, latest 2024The Bloomberg Family Foundation Inc → Istanbul Metropolitan Municipality: $1.0M across 3 grants, latest 2024The Bloomberg Family Foundation Inc → City of Wellington: $1.0M across 3 grants, latest 2024The Bloomberg Family Foundation Inc → World Resources Institute: $786K across 1 grant, latest 2024The Rockefeller Foundation → Mayor's Fund to Advance New York City: $550K across 3 grants, latest 2023The Bloomberg Family Foundation Inc → Organisation for Economic Co-Operation and Development: $547K across 1 grant, latest 2024The Bloomberg Family Foundation Inc → Tel Aviv University: $430K across 1 grant, latest 2023The Bloomberg Family Foundation Inc → City of Lincoln Ne: $400K across 1 grant, latest 2022The Bloomberg Family Foundation Inc → City of Minneapolis: $400K across 1 grant, latest 2022The Bloomberg Family Foundation Inc → Helsingborgs Stad: $400K across 1 grant, latest 2022The Bloomberg Family Foundation Inc → City of Darmstadt: $400K across 1 grant, latest 2022The Bloomberg Family Foundation Inc → City of Cincinnati: $400K across 1 grant, latest 2022Casey Family Programs → World Conference of Mayors Inc: $250K across 3 grants, latest 2024The Robert Wood Johnson Foundation → Mayor's Fund to Adv Ny City: $250K across 1 grant, latest 2020The Bloomberg Family Foundation Inc → Vital Strategies Inc: $235K across 1 grant, latest 2022Conrad N Hilton Foundation → The Mayor's Fund to Advance New York City: $175K across 2 grants, latest 2023Annie E Casey Foundation Inc → Center for Childrens Law and Policy Inc: $170K across 2 grants, latest 2022The Robert Wood Johnson Foundation → African American Mayors Association (Aama): $164K across 1 grant, latest 2024The Bloomberg Family Foundation Inc → City of Sandnes: $135K across 1 grant, latest 2022The Robert Wood Johnson Foundation → Great Lakes and St Lawrence Cities Initiative: $125K across 1 grant, latest 2024Annie E Casey Foundation Inc → Community Law in Action Project Inc: $115K across 1 grant, latest 2024The Bloomberg Family Foundation Inc → City of Helsinki: $115K across 1 grant, latest 2022The Bloomberg Family Foundation Inc: $40M on this topic. Open the funder.The Bloomberg Family Foundati…$40MAmerican Beverage Association: $6.7M on this topic. Open the funder.American Beverage Association$6.7MConrad N Hilton Foundation: $5.7M on this topic. Open the funder.Conrad N Hilton Foundation$5.7MThe Rockefeller Foundation: $3.5M on this topic. Open the funder.The Rockefeller Foundation$3.5MCasey Family Programs: $2.4M on this topic. Open the funder.Casey Family Programs$2.4MThe Robert Wood Johnson Foundation: $1.6M on this topic. Open the funder.The Robert Wood Johnson Found…$1.6MAnnie E Casey Foundation Inc: $1.2M on this topic. Open the funder.Annie E Casey Foundation Inc$1.2MJohn D and Catherine T Macarthur Foundation (Consolidated): $750K on this topic. Open the funder.John D and Catherine T Macart…$750KJustice Innovation Inc: $627K on this topic. Open the funder.Justice Innovation Inc$627KDavid Bohnett Foundation: $522K on this topic. Open the funder.David Bohnett Foundation$522KWeingart Foundation: $330K on this topic. Open the funder.Weingart Foundation$330KBlue Cross of Idaho Foundation for: $7K on this topic. Open the funder.Blue Cross of Idaho Foundatio…$7KUnited Nations Development Programme: received $14M on this topicUnited Nations Development Prog…$14MMayor & City Council of Baltimore: received $4.6M on this topicMayor & City Council of Baltimo…$4.6MRockefeller Philanthropy Advisors Inc: received $4.6M on this topicRockefeller Philanthropy Adviso…$4.6MUnited States Conference of Mayors: received $4.3M on this topicUnited States Conference of May…$4.3MAmerican Beverage Foundation for A Healthy America: received $4.1M on this topicAmerican Beverage Foundation fo…$4.1MThe Mayor's Fund to Advance New York City: received $4.1M on this topicThe Mayor's Fund to Advance New…$4.1MUs Conference of Mayors: received $2.6M on this topicUs Conference of Mayors$2.6MReinvent Stockton Foundation: received $1.3M on this topicReinvent Stockton Foundation$1.3MThe Education Culture and Neighborhood Renewal Company (Dba Hazira): received $1.1M on this topicThe Education Culture and Neigh…$1.1MResources Legacy Fund: received $1.0M on this topicResources Legacy Fund$1.0MCity of Seattle's Office of the Mayor: received $1.0M on this topicCity of Seattle's Office of the…$1.0MCity of Rotterdam: received $1.0M on this topicCity of Rotterdam$1.0MCity of Rochester: received $1.0M on this topicCity of Rochester$1.0MCity of Phoenix: received $1.0M on this topicCity of Phoenix$1.0MCity of Paterson: received $1.0M on this topicCity of Paterson$1.0MCity of Vilnius: received $1.0M on this topicCity of Vilnius$1.0MIstanbul Metropolitan Municipality: received $1.0M on this topicIstanbul Metropolitan Municipal…$1.0MCity of Wellington: received $1.0M on this topicCity of Wellington$1.0MTrustees of Boston University: received $950K on this topicTrustees of Boston University$950KCity of Seattle - Mayor's Office: received $853K on this topicCity of Seattle - Mayor's Office$853KMayor's Fund for Los Angeles: received $825K on this topicMayor's Fund for Los Angeles$825KWorld Resources Institute: received $786K on this topicWorld Resources Institute$786KThe Mayors Fund to Advance New York City: received $750K on this topicThe Mayors Fund to Advance New…$750KMayors Fund for Los Angeles: received $578K on this topicMayors Fund for Los Angeles$578KCity of Seattle-Mayor's Office: received $555K on this topicCity of Seattle-Mayor's Office$555KMayor's Fund to Advance New York City: received $550K on this topicMayor's Fund to Advance New Yor…$550KOrganisation for Economic Co-Operation and Development: received $547K on this topicOrganisation for Economic Co-Op…$547KTel Aviv University: received $430K on this topicTel Aviv University$430KBaltimore City Foundation Inc: received $414K on this topicBaltimore City Foundation Inc$414KThe Mayor's Fund to Advance New York City: received $400K on this topicThe Mayor's Fund to Advance New…$400KConferencia De Superiores Mayores De Religiosos De Mxico Ar: received $400K on this topicConferencia De Superiores Mayor…$400KCity of Lincoln Ne: received $400K on this topicCity of Lincoln Ne$400KCity of Minneapolis: received $400K on this topicCity of Minneapolis$400KHelsingborgs Stad: received $400K on this topicHelsingborgs Stad$400KCity of Darmstadt: received $400K on this topicCity of Darmstadt$400KCity of Cincinnati: received $400K on this topicCity of Cincinnati$400KRegents of the University of California: received $324K on this topicRegents of the University of Ca…$324KTrustees of Columbia University in the City of New York: received $303K on this topicTrustees of Columbia University…$303KBaltimore Civic Fund: received $290K on this topicBaltimore Civic Fund$290KEnvironmental Defense Fund: received $277K on this topicEnvironmental Defense Fund$277KMayor's Healthy City Initiative: received $250K on this topicMayor's Healthy City Initiative$250KWorld Conference of Mayors Inc: received $250K on this topicWorld Conference of Mayors Inc$250KMayor's Fund to Adv Ny City: received $250K on this topicMayor's Fund to Adv Ny City$250KVital Strategies Inc: received $235K on this topicVital Strategies Inc$235KThe Osborne Association: received $219K on this topicThe Osborne Association$219KCenter for Childrens Law and Policy Inc: received $170K on this topicCenter for Childrens Law and Po…$170KAfrican American Mayors Association (Aama): received $164K on this topicAfrican American Mayors Associa…$164KUcla Luskin School of Public Affairs: received $148K on this topicUcla Luskin School of Public Af…$148KCity of Sandnes: received $135K on this topicCity of Sandnes$135KGreat Lakes and St Lawrence Cities Initiative: received $125K on this topicGreat Lakes and St Lawrence Cit…$125KCommunity Law in Action Project Inc: received $115K on this topicCommunity Law in Action Project…$115KCity of Helsinki: received $115K on this topicCity of Helsinki$115KJacob A Riis Neighborhood Settlement: received $105K on this topicJacob A Riis Neighborhood Settl…$105KUnited Way - Los Angeles: received $65K on this topicUnited Way - Los Angeles$65KNational League of Cities Institute Inc: received $50K on this topicNational League of Cities Insti…$50KCity of Rexburg: received $3K on this topicCity of Rexburg$3KCity of East Hope: received $2K on this topicCity of East Hope$2KCity of Ferdinand: received $2K on this topicCity of Ferdinand$2K
12 funders, 58 recipients, grants matching “mayors” only. Ribbon width is proportional to the total given; each funder has its own colour (smaller funders in gray). Hover a name to isolate its flows, click a funder to open it. Drag to move around; zoom with the buttons, a double-click, or the wheel after clicking the map.

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Source: IRS Form 990-PF Part XV and Form 990 Schedule I, tax years 20192025. These are grants already paid, a record of what an organization funds rather than an open call. Private foundations rarely accept unsolicited applications and the route in is usually a program officer; grantmaking charities and associations more often run real application cycles, so check their website. How this data is built, and its limits →