In 2004, delegations comprised of 774 international dignitaries representing 74 countries made official visits to the California Senate. The countries, ranked by number of visitors, were as follows: | |||
| COUNTRY | # VISITORS | COUNTRY | # VISITORS |
| CHINA | 246 | SENEGAL | 3 |
| MEXICO | 48 | SYRIA | 3 |
| AUSTRALIA | 46 | ALBANIA | 2 |
| AUSTRIA | 33 | BURKINA FASO | 2 |
| DENMARK | 31 | ESTONIA | 2 |
| UKRAINE | 30 | ETHIOPIA | 2 |
| JAPAN | 28 | FRANCE | 2 |
| UNITED KINGDOM | 21 | GEORGIA | 2 |
| AZERBIAJAN | 20 | ROMANIA | 2 |
| BRAZIL | 16 | SERBIA & MONTENEGRO | 2 |
| RUSSIA | 16 | TANZANIA | 2 |
| SPAIN | 16 | TOGO | 2 |
| GERMANY | 14 | TUNISIA | 2 |
| TURKMENISTAN | 14 | AFGHANISTAN | 1 |
| ITALY | 12 | ARGENTINA | 1 |
| KYRGYZSTAN | 12 | BELGIUM | 1 |
| UZBEKISTAN | 12 | BENIN | 1 |
| EQUADOR | 11 | CHAD | 1 |
| ANGOLA | 8 | CHILI | 1 |
| BULGARIA | 7 | CONGO, REPUBLIC OF | 1 |
| CANADA | 7 | CYPRUS | 1 |
| ICELAND | 7 | CZECH REPUBLIC | 1 |
| ALGERIA | 6 | EGYPT | 1 |
| INDONESIA | 6 | GUINEA | 1 |
| MOROCCO | 6 | INDIA | 1 |
| TAJIKISTAN | 6 | JORDAN | 1 |
| ARMENIA | 4 | LATVIA | 1 |
| GREECE | 4 | MADAGASCAR | 1 |
| LEBANON | 4 | MALAYSIA | 1 |
| NETHERLANDS | 4 | MAURITANIA | 1 |
| SOUTH AFRICA | 4 | MONGOLIA | 1 |
| TURKEY | 4 | MYANMAR | 1 |
| CAMEROON | 3 | NEW ZEALAND | 1 |
| COTE D'IVOIRE | 3 | NIGERIA | 1 |
| CROATIA | 3 | PAKISTAN | 1 |
| HUNGARY | 3 | RWANDA | 1 |
| MALI | 3 | SWEDEN | 1 |
The delegations studied a wide range of subjects, which are ranked below according to the number of visitors who studied them: | |||
| SUBJECT | # VISITORS | SUBJECT | # VISITORS |
| government/political/ legislative process | 432 | fiscal | 34 |
| protocol/international relations | 213 | public safety | 17 |
| education | 136 | media relations | 12 |
| energy/environment | 79 | social/health issues | 5 |
| international trade | 78 | immigration | 5 |
| agriculture | 73 | gender | 4 |
| budget/finance | 53 | judiciary | 2 |
Note: As some delegations studied more than one subject, the subject area numbers will not coincide with the number of visitors.