diff --git a/.env-ci b/.env-ci
index 1cc42b5e3..91474760f 100644
--- a/.env-ci
+++ b/.env-ci
@@ -5,4 +5,4 @@ SQL_DATABASE=ianalyzer
 SQL_PASSWORD=ianalyzer
 CELERY_BROKER=redis://redis
 ES_HOST=elasticsearch
-DATA_DIR=/ci-data
\ No newline at end of file
+DATA_DIR=/ci-data
diff --git a/backend/visualization/field_stats.py b/backend/visualization/field_stats.py
index 1fee67991..e43108b2c 100644
--- a/backend/visualization/field_stats.py
+++ b/backend/visualization/field_stats.py
@@ -50,3 +50,35 @@ def report_coverage(corpus_name):
     }
 
 
+def cardinality_results(search_result):
+    return search_result['aggregations']['unique_category_count']['value']
+
+def report_cardinality(corpus_name):
+    '''
+    Returns a dict with the number of unique values for each field in the corpus
+    '''
+    es_client = elasticsearch(corpus_name)
+    corpus_conf = CorpusConfiguration.objects.get(corpus__name=corpus_name)
+    cardinality_dict = {}
+
+    query = {
+        "size": 0,
+        "aggs": {
+            "unique_category_count": {
+                "cardinality": {
+                    "field": "PLACEHOLDER",
+                    "precision_threshold": 10000
+                }
+            }
+        }
+    }
+
+    for field in corpus_conf.fields.all():
+        if field.display_type != 'keyword':
+            cardinality_dict[field.name] = 0
+        else:
+            query_for_field = query
+            query_for_field['aggs']['unique_category_count']['cardinality']['field'] = field.name
+            cardinality_dict[field.name] = cardinality_results(es_client.search(index=corpus_conf.es_index, body=query_for_field))
+
+    return cardinality_dict
diff --git a/backend/visualization/tests/test_field_stats.py b/backend/visualization/tests/test_field_stats.py
index e18e456b5..5da9089f7 100644
--- a/backend/visualization/tests/test_field_stats.py
+++ b/backend/visualization/tests/test_field_stats.py
@@ -1,4 +1,4 @@
-from visualization.field_stats import count_field, count_total, report_coverage
+from visualization.field_stats import count_field, count_total, report_coverage, report_cardinality
 
 
 def test_count(small_mock_corpus, es_client, index_small_mock_corpus, small_mock_corpus_specs):
@@ -20,3 +20,12 @@ def test_report(small_mock_corpus, es_client, index_small_mock_corpus, small_moc
         'content': 1.0,
         'genre': 1.0,
     }
+
+def test_cardinality(small_mock_corpus, es_client, index_small_mock_corpus, small_mock_corpus_specs):
+    report = report_cardinality(small_mock_corpus)
+    assert report == {
+        'date': 0, 
+        'title': 0, 
+        'content': 0, 
+        'genre': 3
+    }
diff --git a/backend/visualization/urls.py b/backend/visualization/urls.py
index 62a0ada49..6a16b520f 100644
--- a/backend/visualization/urls.py
+++ b/backend/visualization/urls.py
@@ -8,5 +8,6 @@
     path('ngram', NgramView.as_view()),
     path('date_term_frequency', DateTermFrequencyView.as_view()),
     path('aggregate_term_frequency', AggregateTermFrequencyView.as_view()),
-    path('coverage/<str:corpus>', FieldCoverageView.as_view())
+    path('coverage/<str:corpus>', FieldCoverageView.as_view()),
+    path('cardinality/<str:corpus>', FieldCardinalityView.as_view())
 ]
diff --git a/backend/visualization/views.py b/backend/visualization/views.py
index 02191bc66..4854aade5 100644
--- a/backend/visualization/views.py
+++ b/backend/visualization/views.py
@@ -6,7 +6,7 @@
 from django.conf import settings
 from addcorpus.permissions import CanSearchCorpus
 from tag.permissions import CanSearchTags
-from visualization.field_stats import report_coverage
+from visualization.field_stats import report_coverage, report_cardinality
 from addcorpus.permissions import corpus_name_from_request
 from api.utils import check_json_keys
 
@@ -181,3 +181,15 @@ def get(self, request, *args, **kwargs):
         corpus = corpus_name_from_request(request)
         report = report_coverage(corpus)
         return Response(report)
+
+class FieldCardinalityView(APIView):
+    '''
+    Get the number of different values for each filed in a corpus
+    '''
+
+    permission_classes = [CanSearchCorpus]
+
+    def get(self, request, *args, **kwargs):
+        corpus = corpus_name_from_request(request)
+        report = report_cardinality(corpus)
+        return Response(report)
diff --git a/docker-compose.yaml b/docker-compose.yaml
index 4f0082793..d80b8438d 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -60,12 +60,13 @@ services:
       - cluster.name=ianalizer-es-data-cluster
       - bootstrap.memory_lock=true
       - xpack.security.enabled=false
+      - xpack.security.http.ssl.enabled=false
       - logger.org.elasticsearch.discovery=ERROR
       - logger.org.elasticsearch.transport=ERROR
       - logger.org.elasticsearch.http=ERROR
       - logger.org.elasticsearch.cluster=ERROR
       - "ES_JAVA_OPTS=-Xms2g -Xmx2g"
-      - ELASTIC_PASSWORD=$ELASTIC_ROOT_PASSWORD
+
     ulimits:
       memlock:
         soft: -1
diff --git a/frontend/src/app/corpus/corpus-info/corpus-info.component.html b/frontend/src/app/corpus/corpus-info/corpus-info.component.html
index a2434e1a6..0b26a6e56 100644
--- a/frontend/src/app/corpus/corpus-info/corpus-info.component.html
+++ b/frontend/src/app/corpus/corpus-info/corpus-info.component.html
@@ -32,7 +32,8 @@
                 id="fields" title="Fields">
                 <div class="block" *ngFor="let field of corpus.fields">
                     <ia-field-info  [field]="field"
-                        [coverage]="fieldCoverage ? fieldCoverage[field.name] : undefined">
+                        [coverage]="fieldCoverage ? fieldCoverage[field.name] : undefined"
+                        [cardinality]="fieldCardinality ? fieldCardinality[field.name] : undefined">
                     </ia-field-info>
                 </div>
             </ng-template>
diff --git a/frontend/src/app/corpus/corpus-info/corpus-info.component.ts b/frontend/src/app/corpus/corpus-info/corpus-info.component.ts
index aafda98f0..d9d7bc161 100644
--- a/frontend/src/app/corpus/corpus-info/corpus-info.component.ts
+++ b/frontend/src/app/corpus/corpus-info/corpus-info.component.ts
@@ -1,6 +1,6 @@
 import { Component, OnInit } from '@angular/core';
 import { ApiService, CorpusService } from '@services';
-import { Corpus, CorpusDocumentationPage, FieldCoverage } from '@models';
+import { Corpus, CorpusDocumentationPage, FieldCardinality, FieldCoverage } from '@models';
 import { marked } from 'marked';
 import { Observable } from 'rxjs';
 import { Title } from '@angular/platform-browser';
@@ -18,6 +18,7 @@ export class CorpusInfoComponent implements OnInit {
     corpus: Corpus;
 
     fieldCoverage: FieldCoverage;
+    fieldCardinality: FieldCardinality;
 
     documentation$: Observable<CorpusDocumentationPage[]>;
 
@@ -40,6 +41,9 @@ export class CorpusInfoComponent implements OnInit {
         this.apiService.fieldCoverage(corpus.name).then(
             result => this.fieldCoverage = result
         );
+        this.apiService.fieldCardinality(corpus.name).then(
+            result => this.fieldCardinality = result
+        );
         this.title.setTitle(pageTitle(`About ${corpus.title}`));
     }
 
diff --git a/frontend/src/app/corpus/corpus-info/field-info/field-info.component.html b/frontend/src/app/corpus/corpus-info/field-info/field-info.component.html
index c50735816..d70b9af9b 100644
--- a/frontend/src/app/corpus/corpus-info/field-info/field-info.component.html
+++ b/frontend/src/app/corpus/corpus-info/field-info/field-info.component.html
@@ -36,9 +36,21 @@ <h3 class="title is-5">{{field.displayName}}</h3>
         <p *ngIf="coverage !== undefined">
             <b>{{coveragePercentage}}%</b> of the documents in this corpus have a value for this field
         </p>
-
         <p *ngIf="coverage === undefined">
             Loading coverage data...
         </p>
+
+        @switch(cardinality) {
+            @case(undefined) {
+                <p>Loading cardinality data...</p>
+            }
+            @case(0) {
+                <p>Unique values are only calculated for keyword fields, not free text fields or dates.</p>
+            }
+            @default {
+                <p>There are <b>{{cardinality}}</b> unique values for this field.</p>
+            }
+        }
+
     </div>
 </details>
diff --git a/frontend/src/app/corpus/corpus-info/field-info/field-info.component.ts b/frontend/src/app/corpus/corpus-info/field-info/field-info.component.ts
index 179d37ecb..db9bcd240 100644
--- a/frontend/src/app/corpus/corpus-info/field-info/field-info.component.ts
+++ b/frontend/src/app/corpus/corpus-info/field-info/field-info.component.ts
@@ -11,6 +11,7 @@ import * as _ from 'lodash';
 export class FieldInfoComponent implements OnInit {
     @Input() field: CorpusField;
     @Input() coverage: number;
+    @Input() cardinality: number;
 
     mappingNames = {
         text: 'text',
diff --git a/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.html b/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.html
index deb3764dc..b5ad543cf 100644
--- a/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.html
+++ b/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.html
@@ -1,8 +1,18 @@
 <div class="mc">
-    <p-multiSelect [id]="filter.corpusField.name" [disabled]="!options.length" [filter]="options.length>=6" [options]="options" [maxSelectedLabels]=1
-            placeholder="Choose" [ngModel]="data" (onChange)="update($event.value)"
-            ariaLabelledBy="legend-filter-{{filter.displayName | slugify}}"
-            fluid>
+    <p-multiSelect 
+
+        [id]="filter.corpusField.name" 
+        [disabled]="!options.length" 
+        [filter]="options.length>=6" 
+        [options]="options" 
+        [virtualScroll]="true"
+        [virtualScrollItemSize]="60"
+        [maxSelectedLabels]=1
+        placeholder="Choose" 
+        [ngModel]="data" 
+        (onChange)="update($event.value)" ariaLabelledBy="legend-filter-{{filter.displayName | slugify}}" fluid
+        (onPanelShow)="getAllOptionsFromES($event)">
+        
         <ng-template let-item pTemplate="item">
             <div class="select-label">{{item.label}}</div>
             <div class="select-count">{{item.doc_count}}</div>
diff --git a/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.scss b/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.scss
index 5a368d9d5..4226aad72 100644
--- a/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.scss
+++ b/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.scss
@@ -14,7 +14,10 @@
 .select-label {
     margin-top: 2px;
     white-space: pre-line;
-    max-width: 180px;
     vertical-align: top;
     flex-grow: 2;
 }
+
+::ng-deep .p-multiselect-option {
+    height: auto !important;
+}
\ No newline at end of file
diff --git a/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.ts b/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.ts
index 0563c21e2..d98807908 100644
--- a/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.ts
+++ b/frontend/src/app/filter/multiple-choice-filter/multiple-choice-filter.component.ts
@@ -6,6 +6,7 @@ import { TermsAggregator, TermsResult } from '@models/aggregation';
 import { SearchService } from '@services';
 import { MultipleChoiceFilter, MultipleChoiceFilterOptions } from '@models';
 import { BaseFilterComponent } from '../base-filter.component';
+import { MultiSelectLazyLoadEvent } from 'primeng/multiselect';
 
 @Component({
     selector: 'ia-multiple-choice-filter',
@@ -15,6 +16,7 @@ import { BaseFilterComponent } from '../base-filter.component';
 })
 export class MultipleChoiceFilterComponent extends BaseFilterComponent<MultipleChoiceFilter> {
     options: { label: string; value: string; doc_count: number }[] = [];
+    allOptionsCalled: boolean = false;
 
     constructor(private searchService: SearchService) {
         super();
@@ -25,12 +27,26 @@ export class MultipleChoiceFilterComponent extends BaseFilterComponent<MultipleC
     }
 
     onQueryModelUpdate(): void {
-        this.getOptions();
+        if( this.allOptionsCalled ) {
+            this.getOptions(true);
+        }
+        this.getOptions(false);
+    }
+
+    /** Gets all the filter options from ES, only if there are more than 10 options for that filter */
+    getAllOptionsFromES(event:MultiSelectLazyLoadEvent) {
+        const optionCount = (this.filter.corpusField.filterOptions as MultipleChoiceFilterOptions).option_count;
+        if (optionCount > 10) {
+            this.getOptions(true);
+            this.allOptionsCalled = true;
+        }
     }
 
-    private async getOptions(): Promise<void> {
+    private async getOptions(all: boolean = false): Promise<void> {
+        console.log('fire');
         if (this.filter && this.queryModel) {
-            const optionCount = (this.filter.corpusField.filterOptions as MultipleChoiceFilterOptions).option_count;
+            // optionCount is set to the maximum when the filter panel is shown, but not when other filters change
+            const optionCount = all ? 10000 : (this.filter.corpusField.filterOptions as MultipleChoiceFilterOptions).option_count;
             const aggregator = new TermsAggregator(this.filter.corpusField, optionCount);
             const queryModel = this.queryModel.clone();
             queryModel.filterForField(this.filter.corpusField).deactivate();
diff --git a/frontend/src/app/models/visualization.ts b/frontend/src/app/models/visualization.ts
index f330d4b25..53ff7a4ae 100644
--- a/frontend/src/app/models/visualization.ts
+++ b/frontend/src/app/models/visualization.ts
@@ -113,3 +113,8 @@ export interface ChartParameters {
 export interface FieldCoverage {
     [field: string]: number;
 };
+
+/** number of unique values for that field */
+export interface FieldCardinality {
+    [field: string]: number;
+}
diff --git a/frontend/src/app/services/api.service.ts b/frontend/src/app/services/api.service.ts
index d3fc870de..23a205660 100644
--- a/frontend/src/app/services/api.service.ts
+++ b/frontend/src/app/services/api.service.ts
@@ -2,7 +2,7 @@
 import { Injectable } from '@angular/core';
 
 import { HttpClient, HttpParams } from '@angular/common/http';
-import { interval, Observable } from 'rxjs';
+import { firstValueFrom, interval, Observable } from 'rxjs';
 import { filter, switchMap, take, takeUntil } from 'rxjs/operators';
 import {
     AggregateTermFrequencyParameters,
@@ -13,6 +13,7 @@ import {
     Download,
     DownloadOptions,
     FieldCoverage,
+    FieldCardinality,
     FoundDocument,
     GeoDocument,
     GeoLocation,
@@ -185,6 +186,11 @@ export class ApiService {
         return this.http.get<FieldCoverage>(url).toPromise();
     }
 
+    fieldCardinality(corpusName: string): Promise<FieldCardinality> {
+        const url = this.apiRoute(this.visApiURL, `cardinality/${corpusName}`);
+        return firstValueFrom(this.http.get<FieldCardinality>(url));
+    }
+
     // Download
     public requestFullData(
         data: