Postojna, officially known as the 2nd constituency (), is one of the eight multi-member constituencies (electoral units) of the National Assembly, the national legislature of Slovenia. The constituency was established in 1992 following Slovenia's independence from Yugoslavia. It consists of the municipalities of Ajdovščina, Ankaran, Bovec, Brda, Divača, Hrpelje-Kozina, Ilirska Bistrica, Izola, Kanal, Kobarid, Komen, Koper, Miren-Kostanjevica, Nova Gorica, Piran, Pivka, Postojna, Renče-Vogrsko, Šempeter-Vrtojba, Sežana, Tolmin and Vipava. The constituency currently elects 11 of the 90 members of the National Assembly using the open party-list proportional representation electoral system. At the 2026 parliamentary election the constituency had 209,334 registered electors.

History The 2nd constituency (Postojna) was one of the eight constituencies established by the Determination of Constituencies for the Election of Deputies to the National Assembly Act (ZDVEDZ) () passed by the Assembly of the Republic of Slovenia () in September 1992. It consisted of the municipalities of Ajdovščina, Ilirska Bistrica, Izola, Koper, Nova Gorica, Piran, Postojna, Sežana and Tolmin.

Following the re-organisation of municipalities in October 1994, parts of Ajdovščina municipality were transferred to the newly created Vipava municipality; parts of Nova Gorica municipality were transferred to the newly created municipalities of Brda, Kanal and Miren-Kostanjevica; parts of Postojna municipality were transferred to the newly created Pivka municipality; parts of Sežana municipality were transferred to the newly created municipalities of Divača, Hrpelje-Kozina and Komen; and parts of Tolmin municipality were transferred to the newly created municipalities of Bovec and Kobarid.

In August 1998 parts of Nova Gorica municipality were transferred to the newly created Šempeter-Vrtojba municipality. In June 2006 parts of Nova Gorica municipality were transferred to the newly created Renče-Vogrskoi municipality. Ankaran municipality was created from parts of Koper municipality in June 2011.

In February 2021 the National Assembly passed Amendments and Supplements to the Determination of Constituencies for the Election of Deputies to the National Assembly Act (ZDVEDZ-B) () which defined the Postojna constituency as consisting of the municipalities of Ajdovščina, Ankaran, Bovec, Brda, Divača, Hrpelje-Kozina, Ilirska Bistrica, Izola, Kanal, Kobarid, Komen, Koper, Miren-Kostanjevica, Nova Gorica, Piran, Pivka, Postojna, Renče-Vogrsko, Šempeter-Vrtojba, Sežana, Tolmin and Vipava.

Electoral system Postojna currently elects 11 of the 90 members of the National Assembly using the open party-list proportional representation electoral system. Each constituency is divided into 11 electoral districts () in which each party stands a single candidate. Electors vote for a candidate of their choice in their electoral district and then the votes received by each party's candidates are aggregated at the constituency level.

Allocation of seats was carried out in two stages. In the first stage, seats are allocated to parties at the constituency level using the Droop quota (Hare quota prior to 2006). In the second stage, unallocated seats from the first stage are aggregated at the national level and allocated to parties using the D'Hondt method (any seats won by the party at the constituency level are subtracted from the party's national seats). Though calculated nationally, national seats are allocated at the constituency level.

Since 2000, only parties that reach the 4% national threshold compete for seats at both constituency and national levels. Prior to this there was no threshold at the constituency level but parties needed to reach (c3.4%) to compete for seats at the national level.

Seats won by each party in a constituency are allocated to the candidates with the highest percentage of votes. As a consequence, multiple candidates may be elected from an electoral district whilst others may have no candidates elected. Prior to 2000 parties had the option to have up to 50% of their national seats allocated in the order they appear on their party list (closed list).

Electoral districts Postojna is divided into 11 electoral districts:

1. Tolmin - municipalities of Bovec, Kobarid and Tolmin. 2. Piran - municipality of Piran. 3. Izola - municipality of Izola. 4. Koper 1 - municipality of Koper (Šalara and parts of Koper only). 5. Koper 2 - municipalities of Ankaran and Koper (except Šalara and parts of Koper). 6. Sežana - municipalities of Divača, Hrpelje-Kozina, Komen and Sežana. 7. Ilirska Bistrica - municipality of Ilirska Bistrica. 8. Postojna - municipalities of Pivka and Postojna. 9. Nova Gorica 1 - municipalities of Brda, Kanal, Miren-Kostanjevica, Nova Gorica (except Ajševica, Kromberk, Loke, Nova Gorica, Pristava, Rožna Dolina, Šmaver, Solkan, Stara Gora and Sveta Gora) and Renče-Vogrsko (Oševljek and Renče only). 10. Nova Gorica 2 - municipalities of Nova Gorica (Ajševica, Kromberk, Loke, Nova Gorica, Pristava, Rožna Dolina, Šmaver, Solkan, Stara Gora and Sveta Gora only), Renče-Vogrsko (except Oševljek and Renče) and Šempeter-Vrtojba. 11. Ajdovščina - municipalities Ajdovščina and Vipava.

Election results Summary

Election LeftLevica / ZL / TRS Social DemocratsSD / ZLSD / ZL Freedom MovementSvoboda Positive SloveniaPS / LZJ-PS Liberal DemocracyLDS Let's ConnectPoS / SMC Slovenian People'sSLS / SLS-SMS /SLS-SKD Christian DemocratsSKD New SloveniaNSi Slovenian DemocratsSDS / SDSS Slovenian NationalistsSNS colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 colspan=3 Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats Votes % Seats2026 8,663 6.16% 0 10,399 7.39% 0 48,930 34.79% 4 with PoS 12,763 9.08% 1 31,555 22.44% 2 2,899 2.06% 02022 6,873 4.77% 0 10,684 7.42% 0 56,448 39.19% 4 3,804 2.64% 0 with PoS 9,425 6.54% 0 27,880 19.36% 2 1,255 0.87% 02018 12,036 11.64% 1 13,484 13.04% 1 8,915 8.62% 1 1,713 1.66% 0 7,879 7.62% 0 22,523 21.79% 2 3,082 2.98% 02014 6,919 6.58% 0 8,360 7.95% 0 2,893 2.75% 0 35,983 34.21% 4 2,755 2.62% 0 5,659 5.38% 0 20,059 19.07% 2 1,546 1.47% 02011 2,016 1.54% 0 23,238 17.79% 2 35,222 26.97% 3 1,455 1.11% 0 4,964 3.80% 0 6,312 4.83% 0 29,773 22.79% 2 1,790 1.37% 02008 48,222 38.41% 4 4,971 3.96% 0 3,719 2.96% 0 647 0.52% 0 3,457 2.75% 0 34,584 27.55% 3 6,077 4.84% 02004 16,122 13.97% 1 23,458 20.33% 2 5,794 5.02% 0 9,792 8.49% 1 28,454 24.66% 2 6,146 5.33% 02000 26,469 20.24% 2 39,506 30.21% 3 11,227 8.58% 1 with SLS 10,667 8.16% 0 16,305 12.47% 1 5,979 4.57% 01996 17,179 13.07% 1 32,939 25.06% 2 21,521 16.37% 1 11,711 8.91% 0 17,980 13.68% 1 4,170 3.17% 01992 25,084 16.83% 1 30,659 20.57% 2 11,107 7.45% 0 20,545 13.78% 1 4,185 2.81% 0 12,824 8.60% 0

(Excludes national seats. Figures in italics represent alliances/joint lists.)

Detailed

2020s 2026 Results of the 2026 parliamentary election held on 22 March 2026:

Party Votes per electoral district Totalvotes % SeatsAjdovš-čina IlirskaBistrica Izola Koper 1 Koper 2 NovaGorica 1 NovaGorica 2 Piran Postojna Sežana Tolmin Freedom Movement Svoboda 3,598 2,168 3,203 4,713 6,737 6,579 7,205 2,926 3,670 5,332 2,799 48,930 34.79% 4 0 4 Slovenian Democratic Party SDS 4,448 1,987 1,466 1,757 3,257 4,502 3,256 1,764 3,109 2,818 3,191 31,555 22.44% 2 2 4 New Slovenia – Christian Democrats,Slovenian People's Party and Focus NSi-SLS-FOKUS 2,717 1,181 376 507 929 1,677 1,076 478 1,159 1,015 1,648 12,763 9.08% 1 0 1 Social Democrats SD 1,565 366 594 790 1,151 1,103 952 1,259 768 1,155 696 10,399 7.39% 0 1 1 The Left and Vesna – Green Party Levica-Vesna 654 451 570 1,008 1,004 796 1,129 668 764 1,042 577 8,663 6.16% 0 1 1 Democrats D 1,009 369 438 530 819 1,101 872 539 833 872 572 7,954 5.66% 0 0 0 Resni.ca Resni.ca 402 243 511 959 1,323 595 624 536 619 678 374 6,864 4.88% 0 0 0 Prerod Prerod 337 205 238 303 468 384 371 253 405 618 300 3,882 2.76% 0 0 0 Pirate Party Pirati 442 159 204 356 492 389 361 230 305 391 240 3,569 2.54% 0 0 0 Slovenian National Party SNS 242 208 164 199 438 396 286 122 301 339 204 2,899 2.06% 0 0 0 We, Socialists! MI! 67 47 69 79 109 93 132 61 112 116 51 936 0.67% 0 0 0 Alternative for Slovenia AzaS 88 26 60 71 94 84 103 40 46 71 64 747 0.53% 0 0 0 Greens of Slovenia andParty of Generations ZS-SG 57 32 41 39 60 76 86 32 53 94 31 601 0.43% 0 0 0 Voice of Pensioners GU 32 40 43 62 82 60 46 42 44 62 40 553 0.39% 0 0 0 Karl Erjavec - Trust Party SZ 20 11 25 26 39 38 48 23 43 26 22 321 0.23% 0 0 0Valid votes 15,678 7,493 8,002 11,399 17,002 17,873 16,547 8,973 12,231 14,629 10,809 140,636 100.00% 7 4 11Rejected votes 179 109 104 117 163 174 154 94 172 190 111 1,567 1.10% Total polled 15,857 7,602 8,106 11,516 17,165 18,047 16,701 9,067 12,403 14,819 10,920 142,203 67.93% Registered electors 20,798 12,619 12,491 18,272 25,575 24,934 23,825 14,567 18,171 22,353 15,729 209,334 Turnout 76.24% 60.24% 64.89% 63.03% 67.12% 72.38% 70.10% 62.24% 68.26% 66.30% 69.43% 67.93%

The following candidates were elected: Constituency seats - Matej Arčon (Svoboda, Nova Gorica 2), 7,205 votes; Mateja Čalušić (Svoboda, Koper 2), 6,737 votes; Zvone Černač (SDS, Ajdovščina), 4,448 votes; (Svoboda, Izola) 3,203 votes; Tamara Kozlovič (Svoboda, Koper 1), 4,713 votes; (SDS, Tolmin), 3,191 votes; and Jernej Vrtovec (NSi-SLS-FOKUS, Ajdovščina), 2,717 votes. National seats - Jana Gržinič (SDS, Postojna), 3,109 votes; (SD, Piran), 1,259 votes; Adrijana Kocjančič (SDS, Ilirska Bistrica), 1,987 votes; and (Levica, Koper 1), 1,008 votes.

Substitutions: Jernej Vrtovec (NSi-SLS-FOKUS, Ajdovščina) forfeited his seat on 4 June 2026 upon being elected to the government and was replaced by Andrej Černigoj (NSi-SLS-FOKUS, Ilirska Bistrica) on 9 June 2026.

2022 Results of the 2022 parliamentary election held on 24 April 2022: