diff --git a/README.md b/README.md
index 438c823..d57fb3b 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,7 @@ A collection of GIS functions. Handles conversions to and from well-known text (
 * MultiPointZ
 * MultiLineString
 * MultiLineStringZ
+* MultiLineStringZM
 * MultiPolygon
 * MultiPolygonZ
 * GeometryCollection
diff --git a/lib/geo.ex b/lib/geo.ex
index c130fd5..dc7d6ab 100644
--- a/lib/geo.ex
+++ b/lib/geo.ex
@@ -17,6 +17,7 @@ defmodule Geo do
           | Geo.MultiPointZ.t()
           | Geo.MultiLineString.t()
           | Geo.MultiLineStringZ.t()
+          | Geo.MultiLineStringZM.t()
           | Geo.MultiPolygon.t()
           | Geo.MultiPolygonZ.t()
           | Geo.GeometryCollection.t()
diff --git a/lib/geo/json/decoder.ex b/lib/geo/json/decoder.ex
index ef9135d..6de628e 100644
--- a/lib/geo/json/decoder.ex
+++ b/lib/geo/json/decoder.ex
@@ -11,6 +11,7 @@ defmodule Geo.JSON.Decoder do
     MultiPoint,
     MultiLineString,
     MultiLineStringZ,
+    MultiLineStringZM,
     MultiPolygon,
     MultiPolygonZ,
     GeometryCollection
@@ -175,6 +176,15 @@ defmodule Geo.JSON.Decoder do
     %MultiLineStringZ{coordinates: coordinates, srid: get_srid(crs), properties: properties}
   end
 
+  defp do_decode("MultiLineStringZM", coordinates, properties, crs) do
+    coordinates =
+      Enum.map(coordinates, fn sub_coordinates ->
+        Enum.map(sub_coordinates, &List.to_tuple(&1))
+      end)
+
+    %MultiLineStringZM{coordinates: coordinates, srid: get_srid(crs), properties: properties}
+  end
+
   defp do_decode("MultiPolygon", coordinates, properties, crs) do
     coordinates =
       Enum.map(coordinates, fn sub_coordinates ->
diff --git a/lib/geo/json/encoder.ex b/lib/geo/json/encoder.ex
index 0314bd0..5a54a14 100644
--- a/lib/geo/json/encoder.ex
+++ b/lib/geo/json/encoder.ex
@@ -13,6 +13,7 @@ defmodule Geo.JSON.Encoder do
     MultiPointZ,
     MultiLineString,
     MultiLineStringZ,
+    MultiLineStringZM,
     MultiPolygon,
     MultiPolygonZ,
     GeometryCollection
@@ -202,6 +203,15 @@ defmodule Geo.JSON.Encoder do
     %{"type" => "MultiLineStringZ", "coordinates" => coordinates}
   end
 
+  defp do_encode(%MultiLineStringZM{coordinates: coordinates}) do
+    coordinates =
+      Enum.map(coordinates, fn sub_coordinates ->
+        Enum.map(sub_coordinates, &Tuple.to_list(&1))
+      end)
+
+    %{"type" => "MultiLineStringZM", "coordinates" => coordinates}
+  end
+
   defp do_encode(%MultiPolygon{coordinates: coordinates}) do
     coordinates =
       Enum.map(coordinates, fn sub_coordinates ->
diff --git a/lib/geo/multi_line_stringzm.ex b/lib/geo/multi_line_stringzm.ex
new file mode 100644
index 0000000..95f19e1
--- /dev/null
+++ b/lib/geo/multi_line_stringzm.ex
@@ -0,0 +1,12 @@
+defmodule Geo.MultiLineStringZM do
+  @moduledoc """
+  Defines the MultiLineStringZM struct.
+  """
+
+  @type t :: %__MODULE__{
+          coordinates: [[{number, number, number, number}]],
+          srid: integer | nil,
+          properties: map
+        }
+  defstruct coordinates: [], srid: nil, properties: %{}
+end
diff --git a/lib/geo/wkb/decoder.ex b/lib/geo/wkb/decoder.ex
index 7481bb2..5b2eb04 100644
--- a/lib/geo/wkb/decoder.ex
+++ b/lib/geo/wkb/decoder.ex
@@ -15,6 +15,7 @@ defmodule Geo.WKB.Decoder do
   @multi_point_z 0x80_00_00_04
   @multi_line_string 0x00_00_00_05
   @multi_line_string_z 0x80_00_00_05
+  @multi_line_string_zm 0xC0_00_00_05
   @multi_polygon 0x00_00_00_06
   @multi_polygon_z 0x80_00_00_06
   @geometry_collection 0x00_00_00_07
@@ -38,6 +39,7 @@ defmodule Geo.WKB.Decoder do
     MultiPointZ,
     MultiLineString,
     MultiLineStringZ,
+    MultiLineStringZM,
     MultiPolygon,
     MultiPolygonZ
   }
@@ -299,6 +301,22 @@ defmodule Geo.WKB.Decoder do
       {%MultiLineStringZ{coordinates: coordinates, srid: srid}, rest}
     end
 
+    defp do_decode(
+           @multi_line_string_zm,
+           <<count::unquote(modifier)-32, rest::bits>>,
+           srid,
+           unquote(endian)
+         ) do
+      {coordinates, rest} =
+        Enum.map_reduce(List.duplicate(1, count), rest, fn _, <<rest::bits>> ->
+          {%LineStringZM{coordinates: coordinates}, rest} = decode(rest)
+
+          {coordinates, rest}
+        end)
+
+      {%MultiLineStringZM{coordinates: coordinates, srid: srid}, rest}
+    end
+
     defp do_decode(
            @multi_polygon,
            <<count::unquote(modifier)-32, rest::bits>>,
diff --git a/lib/geo/wkb/encoder.ex b/lib/geo/wkb/encoder.ex
index 5d5abd4..3ae0273 100644
--- a/lib/geo/wkb/encoder.ex
+++ b/lib/geo/wkb/encoder.ex
@@ -15,6 +15,7 @@ defmodule Geo.WKB.Encoder do
   @multi_point_z 0x80_00_00_04
   @multi_line_string 0x00_00_00_05
   @multi_line_string_z 0x80_00_00_05
+  @multi_line_string_zm 0xC0_00_00_05
   @multi_polygon 0x00_00_00_06
   @multi_polygon_z 0x80_00_00_06
   @geometry_collection 0x00_00_00_07
@@ -35,6 +36,7 @@ defmodule Geo.WKB.Encoder do
     MultiPointZ,
     MultiLineString,
     MultiLineStringZ,
+    MultiLineStringZM,
     MultiPolygon,
     MultiPolygonZ,
     GeometryCollection
@@ -194,6 +196,16 @@ defmodule Geo.WKB.Encoder do
       {@multi_line_string_z, [<<count::unquote(modifier)-32>> | coordinates]}
     end
 
+    def do_encode(%MultiLineStringZM{coordinates: coordinates}, unquote(endian_atom)) do
+      {coordinates, count} =
+        Enum.map_reduce(coordinates, 0, fn coordinate, acc ->
+          geom = encode!(%LineStringZM{coordinates: coordinate}, unquote(endian_atom))
+          {geom, acc + 1}
+        end)
+
+      {@multi_line_string_zm, [<<count::unquote(modifier)-32>> | coordinates]}
+    end
+
     def do_encode(%MultiPolygon{coordinates: coordinates}, unquote(endian_atom)) do
       {coordinates, count} =
         Enum.map_reduce(coordinates, 0, fn coordinate, acc ->
diff --git a/lib/geo/wkt/decoder.ex b/lib/geo/wkt/decoder.ex
index c81343e..8e12ba0 100644
--- a/lib/geo/wkt/decoder.ex
+++ b/lib/geo/wkt/decoder.ex
@@ -14,6 +14,8 @@ defmodule Geo.WKT.Decoder do
     MultiPoint,
     MultiPointZ,
     MultiLineString,
+    MultiLineStringZ,
+    MultiLineStringZM,
     MultiPolygon,
     MultiPolygonZ,
     GeometryCollection
@@ -88,14 +90,22 @@ defmodule Geo.WKT.Decoder do
     %MultiPointZ{coordinates: create_line_string(coordinates), srid: srid}
   end
 
-  defp do_decode("MULTILINESTRING" <> coordinates, srid) do
-    %MultiLineString{coordinates: create_polygon(coordinates), srid: srid}
-  end
-
   defp do_decode("MULTIPOINT" <> coordinates, srid) do
     %MultiPoint{coordinates: create_line_string(coordinates), srid: srid}
   end
 
+  defp do_decode("MULTILINESTRINGZM" <> coordinates, srid) do
+    %MultiLineStringZM{coordinates: create_polygon(coordinates), srid: srid}
+  end
+
+  defp do_decode("MULTILINESTRINGZ" <> coordinates, srid) do
+    %MultiLineStringZ{coordinates: create_polygon(coordinates), srid: srid}
+  end
+
+  defp do_decode("MULTILINESTRING" <> coordinates, srid) do
+    %MultiLineString{coordinates: create_polygon(coordinates), srid: srid}
+  end
+
   defp do_decode("MULTIPOLYGONZ" <> coordinates, srid) do
     %MultiPolygonZ{coordinates: create_multi_polygon(coordinates), srid: srid}
   end
diff --git a/lib/geo/wkt/encoder.ex b/lib/geo/wkt/encoder.ex
index 589b222..9e9124c 100644
--- a/lib/geo/wkt/encoder.ex
+++ b/lib/geo/wkt/encoder.ex
@@ -15,6 +15,7 @@ defmodule Geo.WKT.Encoder do
     MultiPointZ,
     MultiLineString,
     MultiLineStringZ,
+    MultiLineStringZM,
     MultiPolygon,
     MultiPolygonZ,
     GeometryCollection
@@ -109,6 +110,12 @@ defmodule Geo.WKT.Encoder do
     "MULTILINESTRINGZ#{coordinate_string}"
   end
 
+  defp do_encode(%MultiLineStringZM{coordinates: coordinates}) do
+    coordinate_string = create_polygon_str(coordinates)
+
+    "MULTILINESTRINGZM#{coordinate_string}"
+  end
+
   defp do_encode(%MultiPolygon{coordinates: coordinates}) do
     coordinate_string = create_multi_polygon_str(coordinates)
 
diff --git a/test/geo/json_test.exs b/test/geo/json_test.exs
index 3f73064..fe49aa3 100644
--- a/test/geo/json_test.exs
+++ b/test/geo/json_test.exs
@@ -227,6 +227,24 @@ defmodule Geo.JSON.Test do
     assert_geojson_equal(exjson, new_exjson)
   end
 
+  test "GeoJson to MultiLineStringZM and back" do
+    json =
+      "{ \"type\": \"MultiLineStringZM\", \"coordinates\": [[ [100.0, 0.0, 50.0, 1], [101.0, 1.0, 51.0, 2] ],[ [102.0, 2.0, 52.0, 3], [103.0, 3.0, 53.0, 4] ]]}"
+
+    exjson = Jason.decode!(json)
+    geom = Jason.decode!(json) |> Geo.JSON.decode!()
+
+    assert(
+      geom.coordinates == [
+        [{100.0, 0.0, 50.0, 1}, {101.0, 1.0, 51.0, 2}],
+        [{102.0, 2.0, 52.0, 3}, {103.0, 3.0, 53.0, 4}]
+      ]
+    )
+
+    new_exjson = Geo.JSON.encode!(geom)
+    assert_geojson_equal(exjson, new_exjson)
+  end
+
   test "GeoJson to MultiPolygon and back" do
     json =
       "{ \"type\": \"MultiPolygon\", \"coordinates\": [[[[102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0]]],[[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]],[[100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2]]]]}"
diff --git a/test/geo/wkb_test.exs b/test/geo/wkb_test.exs
index 0ffd150..61c9210 100644
--- a/test/geo/wkb_test.exs
+++ b/test/geo/wkb_test.exs
@@ -423,6 +423,52 @@ defmodule Geo.WKB.Test do
     )
   end
 
+  test "Decode WKB to MultiLineStringZM" do
+    geom =
+      Geo.WKB.decode!(
+        "00C00000050000000200C0000002000000024024000000000000402400000000000040240000000000003FF0000000000000403400000000000040340000000000004034000000000000400000000000000000C000000200000002402E000000000000402E000000000000402E0000000000004008000000000000403E000000000000402E00000000000040240000000000004010000000000000"
+      )
+
+    expected_coords = [[{10, 10, 10, 1}, {20, 20, 20, 2}], [{15, 15, 15, 3}, {30, 15, 10, 4}]]
+
+    assert(geom.coordinates == expected_coords)
+  end
+
+  test "Encode MultiLineStringZM to WKB" do
+    geom = %Geo.MultiLineStringZM{
+      coordinates: [[{10, 10, 10, 1}, {20, 20, 20, 2}], [{15, 15, 15, 3}, {30, 15, 10, 4}]]
+    }
+
+    assert(
+      Geo.WKB.encode!(geom) ==
+        "00C00000050000000200C0000002000000024024000000000000402400000000000040240000000000003FF0000000000000403400000000000040340000000000004034000000000000400000000000000000C000000200000002402E000000000000402E000000000000402E0000000000004008000000000000403E000000000000402E00000000000040240000000000004010000000000000"
+    )
+  end
+
+  test "Decode EWKB to MultiLineStringZM" do
+    geom =
+      Geo.WKB.decode!(
+        "01050000E0E61000000200000001020000C002000000000000000000244000000000000024400000000000002440000000000000F03F000000000000344000000000000034400000000000003440000000000000004001020000C0020000000000000000002E400000000000002E400000000000002E4000000000000008400000000000003E400000000000002E4000000000000024400000000000001040"
+      )
+
+    expected_coords = [[{10, 10, 10, 1}, {20, 20, 20, 2}], [{15, 15, 15, 3}, {30, 15, 10, 4}]]
+
+    assert(geom.coordinates == expected_coords)
+    assert(geom.srid == 4326)
+  end
+
+  test "Encode MultiLineStringZM to EWKB" do
+    geom = %Geo.MultiLineStringZM{
+      coordinates: [[{10, 10, 10, 1}, {20, 20, 20, 2}], [{15, 15, 15, 3}, {30, 15, 10, 4}]],
+      srid: 4326
+    }
+
+    assert(
+      Geo.WKB.encode!(geom, :ndr) ==
+        "01050000E0E61000000200000001020000C002000000000000000000244000000000000024400000000000002440000000000000F03F000000000000344000000000000034400000000000003440000000000000004001020000C0020000000000000000002E400000000000002E400000000000002E4000000000000008400000000000003E400000000000002E4000000000000024400000000000001040"
+    )
+  end
+
   test "Decode WKB to MultiLineStringZ" do
     geom =
       Geo.WKB.decode!(
diff --git a/test/geo/wkt_test.exs b/test/geo/wkt_test.exs
index 8ba5a44..ecc0a40 100644
--- a/test/geo/wkt_test.exs
+++ b/test/geo/wkt_test.exs
@@ -176,6 +176,122 @@ defmodule Geo.WKT.Test do
     assert(geom.srid == 4326)
   end
 
+  test "Encode MultiLineStringZ to WKT" do
+    geom = %Geo.MultiLineStringZ{
+      coordinates: [
+        [{10, 10, 10}, {20, 20, 20}, {10, 40, 60}],
+        [{40, 40, 40}, {30, 30, 30}, {40, 20, 40}, {30, 10, 20}]
+      ]
+    }
+
+    assert(
+      Geo.WKT.encode!(geom) ==
+        "MULTILINESTRINGZ((10 10 10,20 20 20,10 40 60),(40 40 40,30 30 30,40 20 40,30 10 20))"
+    )
+  end
+
+  test "Decode WKT to MultiLineStringZ" do
+    geom =
+      Geo.WKT.decode!(
+        "MULTILINESTRINGZ((10 10 10,20 20 20,10 40 60),(40 40 40,30 30 30,40 20 40,30 10 20))"
+      )
+
+    assert(
+      geom.coordinates == [
+        [{10, 10, 10}, {20, 20, 20}, {10, 40, 60}],
+        [{40, 40, 40}, {30, 30, 30}, {40, 20, 40}, {30, 10, 20}]
+      ]
+    )
+  end
+
+  test "Decode WKT with spaces between LineStrings to MultiLineStringZ" do
+    geom =
+      Geo.WKT.decode!(
+        "MULTILINESTRINGZ((10 10 10,20 20 20,10 40 60), (40 40 40,30 30 30,40 20 40,30 10 20))"
+      )
+
+    assert(
+      geom.coordinates == [
+        [{10, 10, 10}, {20, 20, 20}, {10, 40, 60}],
+        [{40, 40, 40}, {30, 30, 30}, {40, 20, 40}, {30, 10, 20}]
+      ]
+    )
+  end
+
+  test "Decode EWKT to MultiLineStringZ" do
+    geom =
+      Geo.WKT.decode!(
+        "SRID=4326;MULTILINESTRINGZ((10 10 10,20 20 20,10 40 60),(40 40 40,30 30 30,40 20 40,30 10 20))"
+      )
+
+    assert(
+      geom.coordinates == [
+        [{10, 10, 10}, {20, 20, 20}, {10, 40, 60}],
+        [{40, 40, 40}, {30, 30, 30}, {40, 20, 40}, {30, 10, 20}]
+      ]
+    )
+
+    assert(geom.srid == 4326)
+  end
+
+  test "Encode MultiLineStringZM to WKT" do
+    geom = %Geo.MultiLineStringZM{
+      coordinates: [
+        [{10, 10, 10, 1}, {20, 20, 20, 2}, {10, 40, 60, 3}],
+        [{40, 40, 40, 4}, {30, 30, 30, 5}, {40, 20, 40, 6}, {30, 10, 20, 7}]
+      ]
+    }
+
+    assert(
+      Geo.WKT.encode!(geom) ==
+        "MULTILINESTRINGZM((10 10 10 1,20 20 20 2,10 40 60 3),(40 40 40 4,30 30 30 5,40 20 40 6,30 10 20 7))"
+    )
+  end
+
+  test "Decode WKT to MultiLineStringZM" do
+    geom =
+      Geo.WKT.decode!(
+        "MULTILINESTRINGZM((10 10 10 1,20 20 20 2,10 40 60 3),(40 40 40 4,30 30 30 5,40 20 40 6,30 10 20 7))"
+      )
+
+    assert(
+      geom.coordinates == [
+        [{10, 10, 10, 1}, {20, 20, 20, 2}, {10, 40, 60, 3}],
+        [{40, 40, 40, 4}, {30, 30, 30, 5}, {40, 20, 40, 6}, {30, 10, 20, 7}]
+      ]
+    )
+  end
+
+  test "Decode WKT with spaces between LineStrings to MultiLineStringZM" do
+    geom =
+      Geo.WKT.decode!(
+        "MULTILINESTRINGZM((10 10 10 1,20 20 20 2,10 40 60 3), (40 40 40 4,30 30 30 5,40 20 40 6,30 10 20 7))"
+      )
+
+    assert(
+      geom.coordinates == [
+        [{10, 10, 10, 1}, {20, 20, 20, 2}, {10, 40, 60, 3}],
+        [{40, 40, 40, 4}, {30, 30, 30, 5}, {40, 20, 40, 6}, {30, 10, 20, 7}]
+      ]
+    )
+  end
+
+  test "Decode EWKT to MultiLineStringZM" do
+    geom =
+      Geo.WKT.decode!(
+        "SRID=4326;MULTILINESTRINGZM((10 10 10 1,20 20 20 2,10 40 60 3),(40 40 40 4,30 30 30 5,40 20 40 6,30 10 20 7))"
+      )
+
+    assert(
+      geom.coordinates == [
+        [{10, 10, 10, 1}, {20, 20, 20, 2}, {10, 40, 60, 3}],
+        [{40, 40, 40, 4}, {30, 30, 30, 5}, {40, 20, 40, 6}, {30, 10, 20, 7}]
+      ]
+    )
+
+    assert(geom.srid == 4326)
+  end
+
   test "Encode MultiPolygon to WKT" do
     geom = %Geo.MultiPolygon{
       coordinates: [