diff --git a/src/compub/models/base.py b/src/compub/models/base.py
index 587e3c1..3754302 100644
--- a/src/compub/models/base.py
+++ b/src/compub/models/base.py
@@ -18,6 +18,9 @@ from compub.settings import settings
 from sqlmodel import create_engine, Session
 
 
+DEFAULT_PK_TYPE = int
+
+
 class DB:
     def __init__(self):
         self._engine: AsyncEngine | Engine | None = None
@@ -63,7 +66,7 @@ class DB:
 
 
 class AbstractBase(SQLModel):
-    id: Optional[int] = Field(default=None, primary_key=True)
+    id: Optional[DEFAULT_PK_TYPE] = Field(default=None, primary_key=True)
     date_created: Optional[datetime] = Field(
         default=None, sa_column=Column(TIMESTAMP(timezone=False), server_default=db_now())
     )
diff --git a/src/compub/models/companies.py b/src/compub/models/companies.py
index 5c7b94a..0d2dd33 100644
--- a/src/compub/models/companies.py
+++ b/src/compub/models/companies.py
@@ -14,6 +14,7 @@ from sqlmodel.main import Field, Relationship
 
 from compub.utils import multi_max
 from .base import AbstractBase
+from .geography import Address
 
 
 __all__ = [
@@ -146,6 +147,9 @@ class Company(AbstractBase, table=True):
     address_id: Optional[int] = Field(
         foreign_key='address.id', default=None, index=True
     )
+    address: Optional[Address] = Relationship(
+        back_populates='companies', sa_relationship_kwargs={'lazy': 'selectin'}
+    )
 
     industries: list[Industry] = Relationship(
         back_populates='companies', link_model=CompanyIndustryLink, sa_relationship_kwargs={'lazy': 'selectin'}
diff --git a/src/compub/models/courts.py b/src/compub/models/courts.py
new file mode 100644
index 0000000..2eb76ce
--- /dev/null
+++ b/src/compub/models/courts.py
@@ -0,0 +1,110 @@
+from typing import Optional
+
+from sqlalchemy.sql.schema import Column, Index
+from sqlalchemy.sql.sqltypes import Unicode
+from sqlmodel.main import Field, Relationship
+
+from .base import AbstractBase, DEFAULT_PK_TYPE
+from .geography import StateProvince, Address
+
+
+# Amtsgericht -> Landgericht -> OLG -> BGH
+class CourtClass(AbstractBase, table=True):
+    __tablename__ = 'court_class'
+
+    # Fields
+    short: str = Field(max_length=32, nullable=False, index=True)
+    name: str = Field(max_length=255, sa_column=Column(Unicode(255)))
+
+    # Relationships
+    courts: list['Court'] = Relationship(
+        back_populates='court_class', sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
+    def __str__(self) -> str:
+        return str(self.name)
+
+
+class CourtDepartmentCourtLink(AbstractBase, table=True):
+    __tablename__ = 'court_department_court'
+    __table_args__ = (
+        Index('ux_court_department_court', 'court_department_id', 'court_id', unique=True),
+    )
+
+    # Relationships
+    court_department_id: Optional[DEFAULT_PK_TYPE] = Field(
+        foreign_key='court_department.id', default=None, nullable=False, primary_key=True
+    )
+    court_id: Optional[DEFAULT_PK_TYPE] = Field(
+        foreign_key='court.id', default=None, nullable=False, primary_key=True
+    )
+
+
+# Abteilung innerhalb eines Amtsgerichts (z. B. Registergericht, Insolvenzgericht etc.)
+class CourtDepartment(AbstractBase, table=True):
+    __tablename__ = 'court_department'
+
+    __REG_COURT_PK__ = 1
+    __INS_COURT_PK__ = 2
+
+    # Fields
+    name: str = Field(max_length=255, sa_column=Column(Unicode(255)))
+
+    # Relationships
+    courts: list['Court'] = Relationship(
+        back_populates='court_departments', link_model=CourtDepartmentCourtLink,
+        sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
+    def __str__(self) -> str:
+        return str(self.name)
+
+
+class Court(AbstractBase, table=True):
+    __tablename__ = 'court'
+
+    # Fields
+    name: str = Field(max_length=255, sa_column=Column(Unicode(255)))
+
+    # Relationships
+    court_class_id: Optional[DEFAULT_PK_TYPE] = Field(
+        foreign_key='court_class.id', default=None, nullable=False, index=True
+    )
+    court_class: Optional[CourtClass] = Relationship(
+        back_populates='courts', sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
+    state_province_id: Optional[DEFAULT_PK_TYPE] = Field(
+        foreign_key='state_province.id', default=None, nullable=True, index=True
+    )
+    state_province: Optional[StateProvince] = Relationship(
+        back_populates='courts', sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
+    address_id: Optional[DEFAULT_PK_TYPE] = Field(
+        foreign_key='address.id', default=None, nullable=True, index=True
+    )
+    address: Optional[Address] = Relationship(
+        back_populates='courts', sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
+    parent_court_id: Optional[DEFAULT_PK_TYPE] = Field(
+        foreign_key='court.id', default=None, nullable=True, index=True
+    )
+    parent_court: Optional['Court'] = Relationship(
+        back_populates='sub_courts',
+        sa_relationship_kwargs=dict(
+            lazy='selectin',
+            remote_side='Court.id'
+        )
+    )
+    sub_courts: list['Court'] = Relationship(
+        back_populates='parent_court', sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
+    court_departments: list[CourtDepartment] = Relationship(
+        back_populates='courts', link_model=CourtDepartmentCourtLink, sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
+    def __str__(self) -> str:
+        return str(self.name)
diff --git a/src/compub/models/geography.py b/src/compub/models/geography.py
index db52591..7829064 100644
--- a/src/compub/models/geography.py
+++ b/src/compub/models/geography.py
@@ -1,4 +1,4 @@
-from typing import Any, Optional
+from typing import Any, Optional, TYPE_CHECKING
 
 from pydantic import validator
 from sqlalchemy.sql.schema import Column, Index
@@ -9,6 +9,10 @@ from sqlmodel.main import Field, Relationship
 
 from .base import AbstractBase
 
+if TYPE_CHECKING:
+    from .companies import Company
+    from .courts import Court
+
 
 __all__ = [
     'StateProvince',
@@ -33,6 +37,10 @@ class StateProvince(AbstractBase, table=True):
         back_populates='state_province', sa_relationship_kwargs={'lazy': 'selectin'}
     )
 
+    courts: list['Court'] = Relationship(
+        back_populates='state_province', sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
     @validator('country', pre=True)
     def country_as_uppercase_string(cls, v: Any) -> str:
         if isinstance(v, Country):
@@ -98,3 +106,11 @@ class Address(AbstractBase, table=True):
     street: Optional[Street] = Relationship(
         back_populates='addresses', sa_relationship_kwargs={'lazy': 'selectin'}
     )
+
+    companies: list['Company'] = Relationship(
+        back_populates='address', sa_relationship_kwargs={'lazy': 'selectin'}
+    )
+
+    courts: list['Court'] = Relationship(
+        back_populates='address', sa_relationship_kwargs={'lazy': 'selectin'}
+    )