In 2018, delegations comprised of 838 international dignitaries representing 121 countries, dependencies, and areas of special sovereignty made official visits to the California State Senate, ranked by number of visitors, they are as follows: | |||
| COUNTRY | # VISITORS | COUNTRY | # VISITORS |
| CHINA | 187 | JORDAN | 2 |
| JAPAN | 141 | LATVIA | 2 |
| PORTUGAL | 43 | MALAWI | 2 |
| ARGENTINA | 33 | MALI | 2 |
| GERMANY | 29 | MOLDOVA | 2 |
| MEXICO | 28 | MYANMAR | 2 |
| RUSSIA | 17 | NIGER | 2 |
| GHANA | 15 | NORWAY | 2 |
| CANADA | 12 | PAPUA NEW GUINEA | 2 |
| INDIA | 12 | PERU | 2 |
| NEPAL | 12 | PHILIPPINES | 2 |
| PAKISTAN | 11 | SIERRA LEONE | 2 |
| INDONESIA | 10 | THAILAND | 2 |
| NEW ZEALAND | 10 | TRINIDAD & TOBAGO | 2 |
| AZERBAIJAN | 9 | TUNISIA | 2 |
| SPAIN | 9 | UGANDA | 2 |
| UKRAINE | 9 | UNITED KINGDOM | 2 |
| DEMOCRATIC REPUBLIC OF CONGO | 8 | URUGUAY | 2 |
| NIGERIA | 8 | UZBEKISTAN | 2 |
| SOUTH AFRICA | 8 | ANTIGUA & BARBUDA | 1 |
| AUSTRALIA | 7 | BENGLADESH | 1 |
| KYRGYZSTAN | 7 | BELARUS | 1 |
| ARMENIA | 6 | BOLIVIA | 1 |
| FRANCE | 6 | BOTSWANA | 1 |
| BRAZIL | 5 | CAMBODIA | 1 |
| CHILE | 5 | CAMEROON | 1 |
| COLOMBIA | 5 | CROATIA | 1 |
| ECUADOR | 5 | DENMARK | 1 |
| GUATEMALA | 5 | DOMINICA | 1 |
| ITALY | 5 | DOMINICAN REPUBLIC | 1 |
| KOSOVO | 5 | EGYPT | 1 |
| SOUTH KOREA | 5 | EL SALVADOR | 1 |
| VIETNAM | 5 | ESTONIA | 1 |
| COSTA RICA | 4 | FINLAND | 1 |
| TURKMENISTAN | 4 | GABON | 1 |
| ALGERIA | 3 | GREECE | 1 |
| BARBADOS | 3 | GUINEA | 1 |
| BELIZE | 3 | HAITI | 1 |
| DJIBOUTI | 3 | HONDURAS | 1 |
| ETHIOPIA | 3 | IRAQ | 1 |
| HUNGARY | 3 | IRELAND | 1 |
| ISRAEL | 3 | KENYA | 1 |
| IVORY COAST | 3 | LAOS | 1 |
| LIBYA | 3 | LIBERIA | 1 |
| MALAYSIA | 3 | LITHUSNIA | 1 |
| MALTA | 3 | MACEDONIA | 1 |
| POLAND | 3 | MADAGASCAR | 1 |
| ROMANIA | 3 | MONTENEGRO | 1 |
| ST. LUCIA | 3 | MOZAMBIQUE | 1 |
| TANZANIA | 3 | NICARAGUA | 1 |
| TURKEY | 3 | PANAMA | 1 |
| ZAMBIA | 3 | PARAGUAY | 1 |
| ALBANIA | 2 | SENEGAL | 1 |
| AUSTRIA | 2 | SOUTH SUDAN | 1 |
| BAHAMAS | 2 | SRI LANKA | 1 |
| BELGIUM | 2 | SURINAME | 1 |
| BENIN | 2 | SWAZILAND | 1 |
| BURKINA FASO | 2 | SWITZERLAND | 1 |
| CZECH REPUBLIC | 2 | TOGO | 1 |
| GEORGIA | 2 | ZIMBABWE | 1 |
| JAMAICA | 2 | ||
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 |
| International Relations/Protocol | 291 | Natural Resources/Water | 16 |
| Legislative/Government | 247 | Agriculture | 15 |
| Energy | 35 | Environment | 14 |
| Transportation | 31 | Health | 13 |
| Judiciary | 28 | Public Safety | 12 |
| High Technology | 25 | Social | 10 |
| Gender | 20 | ||
Note: As some delegations studied more than one subject, the subject area numbers will not coincide with the number of visitors. | |||