Donations can be made to political candidates in various amounts. The FEC regulates these donations, and individual groups, excluding PACs, must disclose donations over $250 per year.
The following table lists the top 100 contributions donated to Jim Costa's campaign in 2020.
| Rank | Date | Amount | Contributor |
|---|---|---|---|
| 1 | 2020-02-21 | $5,600 | Robert N. Klein |
| 2 | 2020-02-23 | $3,000 | Brandon M. Geraldo |
| 3 | 2020-01-02 | $2,800 | William F. O'Keeffe Jr. |
| 3 | 2020-02-19 | $2,800 | Joy Caruana |
| 3 | 2020-02-19 | $2,800 | Kenneth Caruana |
| 3 | 2020-02-21 | $2,800 | Harneet Sandhu |
| 3 | 2020-02-21 | $2,800 | Julie Chase |
| 3 | 2020-02-24 | $2,800 | Clinton Reilly |
| 3 | 2020-02-24 | $2,800 | Maria Manning |
| 3 | 2020-02-24 | $2,800 | William H.C. Chang |
| 3 | 2020-02-25 | $2,800 | Matthew Luth |
| 3 | 2020-03-02 | $2,800 | Stephen D. Maddox |
| 3 | 2020-03-03 | $2,800 | Keith Brackpool |
| 3 | 2020-03-06 | $2,800 | Richard V. Gunner |
| 3 | 2020-06-23 | $2,800 | Winston H. Hickox |
| 3 | 2020-06-27 | $2,800 | Laurinda M. Vieira |
| 17 | 2020-06-20 | $2,700 | Donald Peracchi |
| 18 | 2020-02-25 | $2,500 | Navneeta K. Takhar |
| 18 | 2020-02-25 | $2,500 | Sidhardha Lakireddy |
| 20 | 2020-02-27 | $2,000 | Jack Rosen |
| 20 | 2020-02-28 | $2,000 | Theodore B. Harris |
| 20 | 2020-03-03 | $2,000 | Frank M. Pitre |
| 20 | 2020-03-03 | $2,000 | Joseph W. Cotchett |
| 20 | 2020-03-03 | $2,000 | Niall McCarthy |
| 20 | 2020-06-24 | $2,000 | Boram Jung |
| 26 | 2020-06-15 | $1,800 | Hemant Dhingra |
| 26 | 2020-06-18 | $1,800 | Amarjit S. Dhaliwal |
| 28 | 2020-02-22 | $1,500 | Windell Pascascio |
| 29 | 2020-06-30 | $1,200 | Michael Gilifix |
| 30 | 2020-06-30 | $1,150 | Fred Tobis |
| 30 | 2020-06-30 | $1,150 | Garry A. Rayant |
| 30 | 2020-06-30 | $1,150 | Iris Langman |
| 30 | 2020-06-30 | $1,150 | Jonathan Wornick |
| 30 | 2020-06-30 | $1,150 | Kathy A. Fields-Rayant |
| 30 | 2020-06-30 | $1,150 | Phil Goldstein |
| 30 | 2020-06-30 | $1,150 | Richard Gumpert |
| 30 | 2020-06-30 | $1,150 | Sharam Sasson |
| 30 | 2020-06-30 | $1,150 | Stephen J. Miller |
| 39 | 2020-06-29 | $1,001 | Gary A. Kremen |
| 40 | 2020-02-12 | $1,000 | Robert Salazar |
| 40 | 2020-02-22 | $1,000 | Ian Lemay |
| 40 | 2020-02-22 | $1,000 | Lucia E. Noia |
| 40 | 2020-02-22 | $1,000 | Oliver L. Baines |
| 40 | 2020-02-24 | $1,000 | Randall M. Russell |
| 40 | 2020-02-24 | $1,000 | Roberta Vinkhuyzen |
| 40 | 2020-02-25 | $1,000 | Jeremiah F. Hallisey |
| 40 | 2020-02-25 | $1,000 | Peter E. Weber |
| 40 | 2020-02-25 | $1,000 | Victor G. Makras |
| 40 | 2020-02-27 | $1,000 | Michael E. Rue |
| 40 | 2020-02-28 | $1,000 | Angie Rios |
| 40 | 2020-02-28 | $1,000 | Dan Richard |
| 40 | 2020-02-28 | $1,000 | Samuel Norman |
| 40 | 2020-02-28 | $1,000 | Tara Gray |
| 40 | 2020-02-29 | $1,000 | Vanik Pogosyan |
| 40 | 2020-03-02 | $1,000 | Krista Harless |
| 40 | 2020-03-03 | $1,000 | Brian Danitz |
| 40 | 2020-03-03 | $1,000 | Dean C. Storkan |
| 40 | 2020-03-03 | $1,000 | Mark C. Molumphy |
| 40 | 2020-03-03 | $1,000 | Nanci E. Nishimura |
| 40 | 2020-03-03 | $1,000 | Rusty Areias |
| 40 | 2020-03-03 | $1,000 | Tim Jones |
| 40 | 2020-03-31 | $1,000 | Elizabeth Dooley |
| 40 | 2020-05-01 | $1,000 | Chris Miller |
| 40 | 2020-05-02 | $1,000 | James D. Hallowell |
| 40 | 2020-06-10 | $1,000 | Lynn R. Jacquez |
| 40 | 2020-06-23 | $1,000 | Brad Anderson |
| 40 | 2020-06-24 | $1,000 | Ian Lemay |
| 40 | 2020-06-24 | $1,000 | John F. Bennett |
| 40 | 2020-06-25 | $1,000 | Alan Gindi |
| 70 | 2020-01-22 | $500 | Randall Giumarra |
| 70 | 2020-02-11 | $500 | Shawn Cooper |
| 70 | 2020-02-14 | $500 | Robert L. Comstock |
| 70 | 2020-02-20 | $500 | Jeffrey T. Roberts |
| 70 | 2020-02-22 | $500 | Joe H. Lee |
| 70 | 2020-02-22 | $500 | Richard Caglia |
| 70 | 2020-02-24 | $500 | Paul E. Bleiberg |
| 70 | 2020-02-24 | $500 | Thomas T. Coleman |
| 70 | 2020-02-25 | $500 | David Leiter |
| 70 | 2020-02-25 | $500 | Gary Chahil |
| 70 | 2020-02-26 | $500 | Anne MacMillan |
| 70 | 2020-02-28 | $500 | Robert V. Saroyan |
| 70 | 2020-02-29 | $500 | Mike Karbassi |
| 70 | 2020-02-29 | $500 | Pamela Fobbs |
| 70 | 2020-03-02 | $500 | Kenneth Neufeld |
| 70 | 2020-03-02 | $500 | Vic H. Fazio |
| 70 | 2020-03-03 | $500 | Dale Ikeda |
| 70 | 2020-03-03 | $500 | Judy Guggenhime |
| 70 | 2020-03-10 | $500 | Ronald C. Hill |
| 70 | 2020-03-31 | $500 | K.S. Dhillon |
| 70 | 2020-06-10 | $500 | Robert Nardi |
| 70 | 2020-06-11 | $500 | Shawn Cooper |
| 70 | 2020-06-24 | $500 | Jamie Nickle |
| 70 | 2020-06-24 | $500 | John T. Vidovich |
| 70 | 2020-06-24 | $500 | Lauren Marks-Royer |
| 70 | 2020-06-24 | $500 | Rusty Areias |
| 70 | 2020-06-24 | $500 | Sharlyn Woody |
| 70 | 2020-06-24 | $500 | Stephen Jon Larson |
| 70 | 2020-06-24 | $500 | Ted J. Balestreri |
| 70 | 2020-06-24 | $500 | Theodore B. Harris |
| 70 | 2020-06-25 | $500 | Gary Tenzer |
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