In 2015, delegations comprised of 873 international dignitaries representing 132 countries made official visits to the California Senate. The countries, ranked by number of visitors, were as follows: | |||
| COUNTRY | # VISITORS | COUNTRY | # VISITORS |
| CHINA | 179 | VENEZUELA | 3 |
| JAPAN | 92 | ZAMBIA | 3 |
| MEXICO | 37 | BANGLADESH | 2 |
| INDIA | 30 | BELGIUM | 2 |
| HONDURAS | 22 | BOTSWANA | 2 |
| ITALY | 19 | GREECE | 2 |
| DENMARK | 18 | KUWAIT | 2 |
| INDONESIA | 16 | LAOS | 2 |
| CHILE | 15 | LITHUANIA | 2 |
| GERMANY | 14 | MACEDONIA | 2 |
| PAKISTAN | 14 | MAURITANIA | 2 |
| VIETNAM | 14 | MAURITIUS | 2 |
| PALESTINIAN TERRITORIES | 12 | MONGOLIA | 2 |
| ZIMBABWE | 12 | MYANMAR | 2 |
| KAZAKHSTAN | 11 | NAMIBIA | 2 |
| KENYA | 11 | NETHERLANDS | 2 |
| UKRAINE | 11 | NEW ZEALAND | 2 |
| ISRAEL | 10 | PARAGUAY | 2 |
| RUSSIA | 10 | SENEGAL | 2 |
| HAITI | 9 | SERBIA | 2 |
| NIGERIA | 9 | SOMALIA | 2 |
| EGYPT | 8 | SURINAME | 2 |
| SRI LANKA | 8 | TAIWAN | 2 |
| TUNISIA | 8 | ALBANIA | 1 |
| UNITED KINGDOM | 8 | AUSTRALIA | 1 |
| AFGHANISTAN | 7 | AUSTRIA | 1 |
| CANADA | 7 | BELARUS | 1 |
| GEORGIA | 7 | BHUTAN | 1 |
| GHANA | 7 | BURUNDI | 1 |
| TURKEY | 7 | CAMBODIA | 1 |
| BRAZIL | 6 | CAPE VERDE | 1 |
| KYRGYSTAN | 6 | COMOROS | 1 |
| PHILIPPINES | 6 | CONGO | 1 |
| ALGERIA | 5 | COSTA RICA | 1 |
| CONGO (DEMOCRATIC REPUBLIC OF) | 5 | CYPRUS | 1 |
| MOLDOVA | 5 | DOMINICAN REPUBLIC | 1 |
| MOROCCO | 5 | EQUITORIAL GIUNES | 1 |
| SOUTH AFRICA | 5 | FIJI | 1 |
| UGANDA | 5 | FINLAND | 1 |
| BOLIVIA | 4 | GAMBIA | 1 |
| BULGARIA | 4 | GUINEA | 1 |
| BURKINA FASO | 4 | JAMAICA | 1 |
| CAMEROON | 4 | KOSOVO | 1 |
| COLOMBIA | 4 | LATVIA | 1 |
| EL SALVADOR | 4 | LEBANON | 1 |
| HUNGARY | 4 | LESOTHO | 1 |
| IRAQ | 4 | MACAU | 1 |
| LIBERIA | 4 | MADAGASCAR | 1 |
| MOZAMBIQUE | 4 | MALAWI | 1 |
| SOUTH KOREA | 4 | MALI | 1 |
| SPAIN | 4 | MALTA | 1 |
| TANZANIA | 4 | NAURU | 1 |
| UNITED ARAB EMIRATES | 4 | NEPAL | 1 |
| ARGENTINA | 3 | PANAMA | 1 |
| CROATIA | 3 | PERU | 1 |
| ECUADOR | 3 | POLAND | 1 |
| ETHIOPIA | 3 | PORTUGAL | 1 |
| FRANCE | 3 | ROMANIA | 1 |
| GUATEMALA | 3 | RWANDA | 1 |
| IVORY COAST | 3 | SINGAPORE | 1 |
| JORDAN | 3 | SUDAN | 1 |
| MALAYSIA | 3 | SWAZILAND | 1 |
| MONTENEGRO | 3 | SWITZERLAND | 1 |
| NICARAGUA | 3 | TOGO | 1 |
| NORWAY | 3 | ||
| SAUDI ARABIA | 3 | ||
| SLOVAKIA | 3 | ||
| TURKMENISTAN | 3 | ||
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 | 333 | Media Relations | 8 |
| Government/Legislative Process | 316 | Agriculture | 7 |
| Budget/Finance | 58 | High Technology | 7 |
| Energy | 32 | Transportation | 6 |
| Education | 21 | Natural Resources/Water | 5 |
| Social | 19 | Gender | 4 |
| Public Safety | 17 | International Trade/Econimic Development | 4 |
| Environment | 14 | Immigration | 3 |
Note: As some delegations studied more than one subject, the subject area numbers will not coincide with the number of visitors. | |||